There's also (almost) no limit on how low it can go, there are indefinite numbers before $0. As phillipma1957 had once said, Bitcoin will either reach $1M or crash below $10,000, and this is what I also support. It'll either go extremely well, or extremely poor, there's no in-between. This is the main reason I'm concerned and I appear modest when making predictions or any kind of speculations. The risk is quite great, because the amount I've currently accumulated is quite reasonable to end up zero.

People are overestimating the chance of failure now. As more traditional interests get aligned with Bitcoin, they are not going to let something like that happen. They have the money, connections and infrastructure to prevent something like that from happening. In any case, a crash sub $10,000 would wipe out all altcoins with it too as you say.

100 years later 1 bitcoin will be at $1 trillion and your kids or grand kids will curse you for not buying it when it was at $120k.

Mark my words.

$1 million is already not a matter of if anymore.

$1 billion? Obviously the next target. Probably will happen in the next 20 years after we reach 1 million usd.

Then comes $1 trillion.

It surely won’t stop there but I don’t know what comes next after the trillion so I dunno. Was it quadrillion? Maximillion? Megamillion? Gigamillion? Have no idea.

Very often we hear bitcoin price predictions particularly from popular bitcoin analysts, and as what I have understood, they don’t set a price limit on it, they are just anticipating what will be the future price of bitcoin.

Since bitcoin is highly volatile that makes it unpredictable, then it’s normal for us or any bitcoin analyst to predict what will be its next month’s price, year end price or the price 5-10 years from now, but there is no way any bitcoin analyst can set limits for bitcoin price opportunities.

It will probably not exist forever, but I certainly agree with you that putting a cap on Bitcoin's price is most likely wrong. I'm more or less sold to the argument that if fiat can go down in purchasing power for years and decades and centuries, and gold growing more valuable for not only centuries but millennia, it is also possible for Bitcoin to go on appreciating for as long as it's relevant.

Unlike fiat and gold whose supplies inflate continuously, Bitcoin's has an end. And if Bitcoin remains relevant a hundred years from now, its value in fiat must already be staggering.

It's one thing for an asset to have limited supply; it's another to have fixed supply. That's a world of difference. If it becomes cost-beneficial in the near future, the gold market will even have new supply coming from outer space. Extra-terrestrial or asteroid mining will become a thing as soon as technology makes it affordable enough.

It's even wrong to say we can't create any more gold. Gold can be produced in a laboratory, at least theoretically. Of course, it won't be worth it, but it can be done.

Bitcoin's supply, on the other hand, is cast in stone. There are IOUs and hollow numbers and paper coins, though.

That's not how the world works. The government does what the rich people want. If they own a lot of Bitcoin and have businesses that operate because of Bitcoin, then it is not going anywhere. Understanding how the world works is being down to earth, everything else is FUD.

Whether it lasts forever or not will depend on demand, it will not last if people's demand for it is no longer there. It is true that bitcoin is proving itself to be a superior asset, financial instrument and seems to have no limits and no other asset can compare at the present time.  But as we all know, the world is constantly evolving and bitcoin is just a result of that evolution. So if in the future, when something newer and better is created, the demand for it will probably disappear . So I don't think bitcoin will last forever .

Also, everything has a limit and it's just that bitcoin hasn't reached its limit yet, it's not infinite.

I believe that Bitcoin blockchain will exist forever but how we can access it, and use our bitcoin for buying, sellings, deals will be very different in the future than now and in the past. When governments nationally and globally put their eyes more closely on Bitcoin, they will enforce more regulations on it, and there will be less freedom to use Bitcoin blockchain without legal issues with governments.

By being decentralized, Bitcoin blockchain will be for everyone but Bitcoin users will have to be more knowledgeable and careful with legal problems in future.

The market does not only have institutional investors but retail investors, traders, speculators and gamblers. They are all important in the market and their existences mean a lot for the market. At different market phases, their activities will be different and more or less active than the others and themselves in other phases.

The bolded part is one of the best answer. I've been saying for many years that if you have invested in Bitcoin an it's price at the moment is lower than its ATH, you don't have to worry about anything because Bitcoin has one rule, it always surpasses its ATH.
Bitcoin will reach 1 million dollar in the next decade and for that next decade and to my mind, the best aim for everyone will be to aim to have 1 Bitcoin in their hands before it reaches 1 million dollar. I was arguing with my friends, forget about your aim to have 1 apartment in then next decade, aim to have 1 Bitcoin in your wallet.