We will likely have to wait a few centuries to have a better gauge on global impacts and how long lasting or pervasive they will be. We are six centuries out from the final gollabse of Rome (as much as a civilization can gollabse while still having most of the population living as they did the day before and speaking the same language, at least) and Britain only ceded it's empire after ww2 - which I'm assuming is the rough analogue here for comparison purposes. Though with how tangential that comparison is you could possibly make a comparison between Eastern Rome's continued empire and the US supplanting Britain as hegemon while remaining closely allied. 