Everyone seems to assume that the premise of the discussion is that the US wants to maintain its hegemony

I think that's what you all believe.
However, I believe that ordinary Americans—since the US is self-sufficient in terms of food, clothing, and shelter resources anyway—might instead choose to hand over global hegemony to China,
let China take responsibility for the world order,
and opt for isolationism.
They might even gradually withdraw their military bases.
Even if the entire world settles oil trades in Yuan,
the US can still be self-sufficient with oil from its own producers...