How many centralized and custodial services have failed, yeah, countless. Ftx was controlled by a central authority and what happened, it was run to zero, to bankruptcy. BTC isn't going to collapse because it isn't controlled by a central authority.

Take note that there is nothing like the 'node network', any user in the BTC network can run their own BTC node, it is not made specially for any group of people, you can run your own full node and contribute to the network, and you don't control it by running a node.

It is even easier for centralized services to collapse because they are controlled a single person or just a few people. Sam Bankman-Fried mismanaged FTX funds by spending it on personal luxurious and political donations. It was possible because he controlled almost all the company's finances. But the Bitcoin network is highly decentralized.

Nothing is certain in life this is why everyone involved in Bitcoin shouldn't put all hope on Bitcoin. It is a developing asset hence we should recognize that there is a need for improvement. But I think the main thrust of this thread is to identify how we can support the system because there is a saying that we are all Satoshi. All of us who believe in Bitcoin have some role to play in protecting Bitcoin from attacks. We might not have great influence on how the system is controlled but our little input can make a difference. It could be as simple as keeping our coin in non-custodial wallets, promoting P2P, engaging in Bitcoin awareness, or even advocating for the legalization of Bitcoin in our home country.

Well, if people stop running full nodes, then the experiment will fail.... and it's success is also dependant on people using it.

We know that the Block reward are Halved and that it will not be enough to incentivize miners to continue mining in the coming years, so Miners fees will be very important in the future and that is why transactions on the Blockchain are so important, because it generates Miners fees.

Centralised exchange is a threat to people who use them, but I don't think it's a threat to Bitcoin. If every centralised exchange crashed today, bitcoin would still be here, the price might take a massive hit, but it would survive. Secondly as ironic as it sounds, the exchanges don't want anything bad to happen to Bitcoin, they might be nearly worthless without Bitcoin.

I believe one major threat to Bitcoin is the government of various countries. We may not admit it but they joke so much power. If they decide to cramp down on Bitcoin a whole lot more or ban it completely, it's going to be a problem to have Bitcoin if having Bitcoin is illegal.

Another threat to Bitcoin is NFTs in Bitcoin Blockchain. It makes the network congested and increases the network fees and also makes confirmation take more time you're ready to pay a ridiculous amount and sometimes you might even pay very high and still wait hours for your transaction to be confirmed.
Generally, high network fees are a problem toforitcoin, but that wouldn't happen often if not for ordinals in the Blockchain.
When people can't get transaction confirmation in 10 minutes with very low fees, it discourages adoption.
To me, these are the biggest threats to Bitcoin.  

Many people from the past also said that, I mean those people or investors that is not believing in bitcoin to acquire a huge amount of price and no one expect in the past that it could break it own ATH, I get many people are still reluctant and cautious in bitcoin and its normal we cant control that, I also consider that there might be s possibility that bitcoin could not last long as we though, but that is the dream of many bitcoin investors to make and witness bitcoin to become more powerful to the point that it could be legalized all over the world. Anyway if we cant expect that bitcoin will exist and remain strong forever then lets just take advantage this moment or while its still around to earn more money, simply taking and accepting all the blessings that bitcoin could give, thats the best thing we could do while its still around.

There are some of us that mine at a loss and will continue to do so regardless, and for no other reason than we love what Bitcoin stands for!
We know that each block found is another stab at the heart of central banks and this corrupt fiat system.