You say inexoribly linked, but I'm certainly willing to bet by the end of my lifetime the US will not even be in the #2 spot globally. Why can't the USD collapse? Lots of things that were unthinkable 6 months ago are common opinion today.
Not sure this says what you think. Simple GDP growth math has India and China passing the US in a few decades so that's not even controversial. If you are suggesting some major calamity/collapse in the US that somehow doesn't impact the rest of the world, I would find that highly unlikely.