The chance is really small that the US Dollar can crash and that is because it is still many used so that is nice for the dollar itself and you see of course that Bitcoin is getting more used and that is nice.
But one thing that I can say for sure is that Bitcoin will be the most used payment method in the future.
Yes, a dollar crash is possible but US can recover it also in a span of months.When these crisis happens, its also an opportunity for investors, as the economy recovers, they also gain.
When people talk of a crash here, they mean a permanent crash where the dollar is replaced by some other currency as the world's reserve currency.
In that case, a lot of turbulence can be expected until a new currency becomes the accepted favoured currency.