I don't think all of us here now will still be alive by that year 
Miners will still mine Bitcoin and continue the process. The price may increase at a high price and maybe at that year, the adoption happen in all countries.
If you talk about accumulate Bitcoin, you still have that and are not stopping especially if you want to give your Bitcoin as your legacy. No need to worry about the future as we may not live long like Bitcoin.
It is better to enjoy the ride while accumulating Bitcoin and our grand children will continue what we have done.
Miners will still mine Bitcoin and continue the process. The price may increase at a high price and maybe at that year, the adoption happen in all countries.
If you talk about accumulate Bitcoin, you still have that and are not stopping especially if you want to give your Bitcoin as your legacy. No need to worry about the future as we may not live long like Bitcoin.
It is better to enjoy the ride while accumulating Bitcoin and our grand children will continue what we have done.
Yeah, despair is a thing for the future, now we need to cherish what we can do and act accordingly on it.
We have lots of time to come prepared