You would never know what is going to happen tomorrow with bitcoin, because life is full of uncertainty, same thing is also applicable to the questions that you’re asking, I think bitcoin is going to last for decades to come, why don’t you look at the positive side of bitcoin, people loosing their private keys is understandable, but everyone can’t loose their private keys, that doesn’t mean that bitcoin isn’t going to last for a longer period, why don’t you look at the value of bitcoin and the potential of bitcoin in that time you’re talking about, Bitcoin have survived all this years, different factors have tried to bring bitcoin down, but it’s been impossible, do you have to forget how Bitcoin have stay up all this years, after several Government policies against Bitcoin.
People are getting wiser now when it comes to private keys, I know of people who now store their private keys in their “will” should in case of unforeseen circumstances.

Bitcoin will last for a long time, including generations after generations. It is a system that is created in such a way that no one is controlling it, so there is no option to shut it down or stop it. You can run a node on your computer and create a bitcoin wallet there, and make transactions. Now it is true that people's seed phrases are being lost, the owner is dying, so many bitcoins have been frozen so far, and it is normal that such incidents will happen in the future. However, since the price of bitcoin was low in the past, people did not give it much importance, now that bitcoin has become valuable, people will give importance and try to ensure that the seed phrase is not lost. Even then, if a large number of bitcoins are frozen every decade, it is not that bitcoin will be lost forever. Over time, the popularity of Bitcoin will increase, the demand will increase and the supply of Bitcoin will continue to decrease, while if there is a freeze, the supply in the market will also decrease, resulting in an even higher price. It is true that there is no central system to recover the wallet passphrase if it is lost. But now that people are aware, they store it properly and also give access to it to their children or trusted family members so that they can use it in absence. So in reality, the idea that Bitcoin will completely disappear due to the lack of access to some Bitcoins is completely baseless.

Whem all private keys will be lost? Do you not know that is not possible.

Many people in the past just bought bitcoin with a very small amount of money to them, not knowing bitcoin will increase significantly but theyr just buy it. After bitcoin price increased, they noticed their coins that was worth the amount they can afford to lose is now worth thousands or millions of dollars.

Many people will not make the mistake of losing their private key like before.

The more bitcoin that is lost, the scarcity will increase, which will make the price to increase.

I think one generation is about 30 years and working with that, will Bitcoin last as longb as we imagine? Some private keys are already lost and many more are getting lost because their owners died without passing then on or they simply lost them.

Based on these possibilities, what do you think will happen in some decades when many of the private keys are lost?

What of when nearly all are lost?

Even though we may not know when this would be, I wonder what will happen when they're all lost.

If you die today, will your coins be lost?

How can be expect all the private keys or seed phrases to get lost for all the non-custodial wallets holding bitcoins? The first few served a lesson for everyone else to be more careful with these things, and we can already see the effects of that today. People are more and more vigilant when it comes to keeping their private keys and seed phrases safe because they know that if they lose these things, they will lose their money, and no one would want that.

When it comes to deaths, I think we have already reached a position in this industry where people are now well-aware of how they need to manage these things, like finding a way to make their assets accessible for their children and family once they pass away, and moving into the future, there will surely be better ideas and ways for people to do that, so deaths are not really going to cause Bitcoin to not last and get lost because it will keep getting passed on to the newer generations in one way or another.

If a generation is 30 years it means that Bitcoin has already lasted more than half of that and has the potential of lasting longer than that well let me not act too sure like the future is predictable or I've been there before but my potential is based on the historical achievement of Bitcoin that's why i said the potential to do better is there.

Storing our seed phrase and the privet key in a place that none would be able to get access to it very important, but some people are very careless about their wallet security’s which is why the hackers find it very easy to hack most people wallet. If not some investors that they don’t care about their money can you imagine that some will have huge amounts of money in their wallet, but they prefer to save their seed phrase in their phone instead of them to find a very cool place to store their seed phrase.