OP you need to underline, the threat of altcoin against Bitcoin is not just this time being discussed, one year Bitcoin was developed in the Crypto Market Threating it already exists, but Bitcoin has developed And running for about 16 years, over time the issue of threats disappeared like in the swallow of the earth, the proof is that until now there has been no altcoin that can defeat Bitcoin.

Not only Altcoin, the government has also been a threat to Bitcoin, the facts on the ground are precisely the government itself that focuses on the adoption of large bitcoin, you can see for yourself one by one Altcoin CEO runs away and is involved in various cases, but the creator of BitcoinUntil now it has never been found.

With the facts, still thinking about you there is an altcoin threat to Bitcoin, you should just throw away such thoughts, try to focus on goals The main you enter the world of crypto, want to invest, trade, mining and so on that you need to think about, no need to think about Altcoin is a threat to Bitcoin.

Slightly unpopular opinion: It might eventually, but probability is currently very low for the short to medium term. (There were times where high-profile Bitcoiners like Paul Sztorc thought the danger was actually quite high, though.)

But first we have to clarify: when would an altcoin be exactly a threat to Bitcoin? If it can reach a similar market cap? I don't think so.

First, many altcoins simply don't provide the qualities of Bitcoin like censorship resistance, security and decentralization. Even Ethereum is significantly more centralized than Bitcoin, and coins like BNB, TON or XRP are directly company coins which could also work as traditional client-server applications.

If such a centralized altcoin was to surpass Bitcoin in terms of market cap price, this would mean basically nothing. It's like, let's say Saudi Aramco surpassing the market cap of Apple. It's simply different markets with different users and use cases, although there may be some competition (because both are investment assets), but there is no threat that Bitcoin could decline only because of that "flippening".

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There is however a scenario we as Bitcoiners should always take into account, which is that eventually Bitcoin's security budget could become low enough for another decentralized altcoin to take the crown -- and this would be a threat perhaps.

Security budget is basically the money invested by miners which rises the cost of an 51% attack. It depends on the sum of block rewards and transaction fees, and if it becomes too low (e.g. because the "fee market" doesn't work), then we could be heading into a problem.

But there are solutions to this -- from merged mining sidechains and altchains, to perhaps even voluntary fees, up to a small "tail emission" as last resort which would have to be decided very carefully. This is controversial, but there are even ways to implement a tail emission without putting the 21 million limit into danger, for example with a small burnt fee per transaction (some altcoins already have implemented this).

However, if this process fails, and Bitcoiners are so stubborn that they ignore this threat, this may give the opportunity to an altcoin to surpass Bitcoin. And this could be a threat if said altcoin provides the qualities of Bitcoin -- decentralization and censorship resistance.

I don't think that altcoins can challenge Bitcoin on value just because Bitcoin's distribution will never again be able to be replicated.  However, in actual usage I think that altcoins will surpass Bitcoin.  Bitcoin is going to be the store of value (gold) while altcoins will most likely one day take over the payment processing (VISA) side of things.  I also don't think Bitcoin can handle the tokenization of regular assets, so there is room for more than one cryptocurrency.  Bitcoin will in my opinion always be where most of the value is held though.

We can say, bitcoin is like the gold metal among other metals. Surely, there will be other alts that can have other usage in the market, maybe a lot cheaper than btc when it comes to financial transactions, however, btc will remain the top cryptocurrency in the market. As we have seen, thousands of alts have been created and marketed, and yet, up until now, btc is still in its top position. We may have used other alts for transfer purposes, but the popularity alone is one of the advantages of btc.

Just heat to the Alts section in this forum and you will see that there are so many threads about those long list of coins, tokens or any crypto project. And yet, up until now, no one has surpassed the position of btc in the market. Some may have large following but btc is usually the first choice of most crypto users and the first to recognize by noncrypto users when you talk about crypto.

I don't see this as a general view point but a personal views. And personally I have not seen any altcoin to be a threat to bitcoin. As you said in those days, Ethereum believers were saying the same thing that Ethereum would surpassed bitcoin and today it is not even close to 3% if bitcoin and it is the closest to bitcoin and if Ethereum which is closest to bitcoin can't beat or be a threat to bitcoin as they proclaimed before then I don't think any other coin is a threat to it.
The demand and supply is very much fundamental in the cryptocurrency market.

We should rephrase the title and make it like this -

"Bitcoin, a threat to all altcoins"

It should be like that. The community has dealt with so many "threats" to Bitcoin for the past years and none of them became as good as BTC. Ethereum? it won't be a threat to Bitcoin, it's a POS and compared to PoW. People like more with security but the richer people likes more control and money which goes to POS.

As long it would really be having that huge community dominance then it will really be that still can be beaten but since we do know into this market is unpredictable then it will really be that not giving out that 100% assurance that we wont really be coming into point and this is why as a personal point of view then you should be trying out to diversify your investment on which it isnt really just that limited to crypto but also in other investments as well because even if we do say about putting up all of your money on Bitcoin but still it wont really be that removing into that point that you are really that still included into the risks on which this isnt really that an exemption. This is why its really that important that you shouldnt really be that investing on one basket on which its really that better that you do really know on what are the things that you would gonna need to do to lessen up the risks. Altcoins isnt a threat to Bitcoin and it would never be but since this market doesnt give out assurance then it will definitely an another story.

Although we don't know what will happen in the future, Bitcoin will still lead crypto. Altcoin is not a threat for Bitcoin but altcoin give another hope to people to make money besides from Bitcoin. We don't need to prove anything because people out there will see by themselves how strong Bitcoin to survive in the hard situation especially this time.

While many altcoin replace the position in the crypto market, Bitcoin still stay at the position and lead the market. No matter how hard the negative news release, Bitcoin still survive and even get more supports from community. That is different from the altcoin when they lose support from their community and make the project lose power and disappear.

Altcoins can never be a threat for Bitcoin because Bitcoin is the king  and all other alts are following it. We all know that I never heard this before TBH that alts are threat to BTC, the reason you mentioned that other said, are also illogical to me, in short we don't have to stretch this out because reality is in fron of us.

We know alts follow BTC, and most of the dominance is of BTC too, and when people invest in alts they take profit they have to swap their profit into more stable and profitable asset and for them the easiest way is to conver them into BTC so now or in near future they will invest in BTC.

Bitcoin is, to some extent, an index of the entire crypto industry. When the crypto industry develops, when new ideas, new social and financial technologies appear in it, the price of Bitcoin also grows. When scam coins, empty coins that have no meaning, appear en masse, the price of Bitcoin falls along with the cost of all other coins.

Therefore, in my opinion, we can say that alternative cryptocurrencies can negatively affect Bitcoin.

However, the main danger for Bitcoin does not come from alternative cryptocurrencies. The main danger for Bitcoin is a departure from the principle of decentralization, when mining is centralized, development is centralized, and coin storage is centralized.

This is what can destroy the first cryptocurrency.