It will be a glorious day when America leaves Asia-Pacific and Europe.
I doubt it, when they leave some other arse will just turn up. The US has set a very bad example to future super powers on how act. Their style can be summed up in three words might; might makes right.
What makes you think that after the US has withdrew from Asia that the new imperial overlord (most likely China) will act in a different way? For all we know they might even be worse (although they would have to make quite an effort).