Back in 1979 an author called David Graham wrote a great flying book called "Down to a Sunless Sea" which, though fiction, detailed what might happen if the world stopped selling the US oil for the worthless USD.
That is the big worry here IMHO. If America cannot afford to pay for its oil imports and the oil exporters no longer accept the USD in payment, the ramifications would be swift and catastrophic for the US and in turn the entire world.
Everyone is aware of this of course and there is a many reasons to not allow that to happen. The dilemma is that the US government needs to increase interest rates to stem the decline of the USD, but that very act may guarantee that the US goes into recession.
There is a very interesting few months in store for us all.