but that wouldn't really work out since, well i guess she doesn't actually know probably, that vision re-died when he left the hex.
and if that was the case, i don't know how they'd get around the whole "you lose all of your memories when you're brought back in that reality" thing
We don't really know if Vision not remembering is a being brought back to life thing, or a Wanda thing. She might have wanted him to forget.
Wanda's powers only seem to be growing. I think either she finds a way to extend the hex to effectively cover the whole planet, or her powers are amped again when doesn't have to worry about maintaining the barrier, or controlling a whole town. Fully reviving someone might be possible at that point.