what if dollar hegemony goes away?

with the news that iran is allegedly considering allowing only renminbi oil through the strait, i figured it would be a good time to ask: what happens inside and outside the us when dollar hegemony goes away? will manufacturing be reshored to the usa? will it usher in a wave of prosperity for the usamerican colonizers? will it free the periphery from the chains of empire? most of these are answers i feel like i can probably guess at but i haven't read lenin's imperialism yet so i'm hoping for someone more knowledgeable to say.