I think predicting the presence of bitcoin is very very difficult, but if everyone continues to believe and use bitcoin. more advanced and popular technologies in the future.
Yes agree, we do not need to expect bitcoin to last up to 50 or 100 years, for a year or 5 years can make us successful and rich then the sixth year bitcoin die then we must be ready.
It would be better if we are just going to be optimistic about what is going to happen in bitcoin to the upcoming years, we don't want bitcoin to end, we have a lot of dreams that we wanted to achieve with bitcoin, and I know that is going to happen to all of us, to do that, we just have to keep on doing what we are doing to earn bitcoin, that is the best idea so far.