It doesn’t have to crash per se. The value can go down. As in inflation. This is already happening in some sense. It’s just accelerated when the real value you get back is lesser for dollar by the day. A few years back can you imagine buying a $1000 phone? The measured inflation is really convoluted. I doubt it measures the true value of a dollar. The good thing is other currencies will just get devalued equally considering dollar is the world currency for the most part.