If in case that happens, it's either USD has experienced hyperinflation or most people jumped into the btc train. I don't really see that happening without hyperinflation because theoretically, 1 bitcoin would cost $100 million, which is an awful lot and even TA suggests that it's not possible within the next century or so.
Hyper inflation, I would love to use your words, the economic crisis will surely happen, and it will destroy the economy of the whole world. Let's try to think, if the whole world uses bitcoin, and when it reaches that value, then suddenly it disappears or collapses. I think it will be a disaster for everyone. It was horrible. And I see that it will never happen even after two centuries.