How would they separate though? Super Dragon Balls? Cause there ain't no way they are gonna stay Vegetto.
That and that alone make me skeptical that Vegetto will ever be a thing again, unless they rinse repeat and have them defuse under "unknown circumstances" like they did inside Buu. Or Whis or someone knows some magic to undo the fusion.... I dunno...
We will most likely see Gogeta. Then perhaps a new type of fusion. Perhaps one special to Universe 10 gods that Gowasu could help them with too.
Like, I could see Goku and Vegeta being the ones to bring up Potara fusion, and Gowasu would be like "Similar, but not quite" or some shit.
Logically a fusion of both Zamasu's should > Gogeta and Vegetto, seeing as how both are stronger than Goku and Vegeta separately as is. So a new fusion with some kinda godly boost might happen.
GOTTA HAVE MY HAX!
Then Beerus will still be said to be stronger by like 50% or some crazy nonsense.
I still dont see how this will end without Zeno's muffin button being pushed. Being stronger than both Zamasu's or a fusion is great, but if they cannot die or be sealed away, then......