Well, Bitcoin can easily crash too. It happened a bit ago, no one can predict it going to complete 0. As far as Bitcoin being a solution for an economic meltdown, I just don't see that happening. It's no surprise Bitcoin isn't a mainstream thing, so for people to say, "forget fiat, hello Bitcoin" to a currency with fluctuating prices, I see that is least feasible. The US needs to stop getting so involved in foreign affairs. Keep manufacturing in the country and maybe we wouldn't owe trillions to China.
Bitcoin is the solution to unsound lending (lenders who have not saved, and loaners who are not willing or able to pay back). Lending reduced to a prudent level will be the result of the all bitcoin endgame. Obviously, because of this, governments will have to be smaller, and the idea of having a government at all will wane. Anarchy!! Now, get out of bitcoin and hoard your dollars, cowards!