What would happen if all Bitcoin is mined and all Bitcoin is lost?
I guess that at that point bitcoin would not exist anymore, that's it. You are mentioning bitcoin but it's the same with anything else: what happens if we extract all the oil available on our planet? It's done, no more oil. What happens if we kill all the elephants? No more elephants. And so on. Anyway a scenario like the one you are mentioning is extremely unluckily to happen, why would people choose to deliberately get rid of something that has a high value?
I do not understand why people think such useless things that have no head or foot and it is just a waste of time if we just keep on thinking what will happen if all the Bitcoin is lost and all such stuff ?
Bitcoin is there for the last 10 years and nothing has happened to Bitcoin credibility so why people are still worried and keep on asking such things ?
I mean seriously don't have any other important thing to think about or if they have nothing to think about they can at least think of all they can accommodate bitcoins and invest in bitcoins other than thinking of this useless thoughts.