Yeah I mean the hero from Morrowind who we played as. It would not be a lore breaking occurrence. It would make sense for him to be overseeing the dunmer who migrated there.. and to oversee the troubles of the civil war there.
Except, MY nerevarine doesn't give a [censored] rat's ass about the dunmer, or anyone for that matter. Seeing MW go boom would only annoy him, at best, as his book collection and priceless relics would have been destroyed. Someone else's nerevarine may have became the CoC, or did go on the expedition to Akavir. Fact of the matter is, the fate of the nerevarine after MW is left to the player, and solely the player. Bethesda was kind enough to allow this to continue on what we want to be the nerevarine's canonical actions and fate.
Also the nerevarine is a Dunmer in canonical terms.
Wrong. The fate of the nerevarine was purposely made very vague. To you, the nerevarine was dunmer. To me, it wasn't. And there is nothing contradictory or wrong with having any other race be the nerevarine. [censored], even the "prophecy" was incredibly vague.
Frankly, I don't want a nerevarine popping up, as it does establish a canonical fate to the nerevarine, instead of our own.
As for the fate of Vivec, it's also ambiguous. Personally, I prefer The Trial of Vivec fate.