If democracy in the US falls apart, it will take an event of World War 3 scale to fix this.
But thinking of it, your estimate might still hold under that premise.
As a European, I have still hopes for the US though. The western world is already reorganizing itself without the US in the center, but we and the world in general still need the US as being more of an ally than an adversary (at the moment, it's more of an adversary to the western world, sadly).
