Well, only if that simultaneously causes collapse of China, Russia, and perhaps also India. Otherwise you will have imperial system, only not American. And you can believe me, you don't want to live under Russian sphere of influence (can't speak about the rest, but neither China is attractive for me).

But yeah, if collapse of imperial America assures the collapse of the imperial systems worldwide and also takes care of the militant groups that would remain in the created power vacuum, I'm all for it. Then again, I have my doubts that one sided collapse of American imperialism will solve the problem.