Basically, each of our lives has been a gamble because we don't know what will happen next or what our future will look like.
After all, bitcoin is the result of technological development and it cannot last forever, there will come a time when the need for it will no longer exist and will be replaced by something more advanced. But the important thing is that it is still a very new asset and is it too early for us to think about its disappearance? Gold can last thousands of years, fiat money can last hundreds of years...a groundbreaking asset like bitcoin can't last 100, 200 years? And in my opinion, just this period of time is enough for us to enjoy life with bitcoin, we should not think about things that will not happen with our generation or in the near future.
Paper money technically can't last hundreds of years, it's just the system that last hundreds of years. The reason why it can last so long because the government forcing people to use it and not a lot people want to invest.
Bitcoin can last for 100, 200 years or more because it's decentralized, no one can limit or stop the network. But, it's true that we should only focus on our generation because human can't being eternal.