There are plenty of people out there with the initials of MK.
He was Dragged away to an Ordinary gate as Vivec the city was seiged nothing special.
Where'd you get that idea? Although, yes, Vivec has (officially) disappeared.
My hope for the religious future of Morrowind's inhabitants is something a lot more cleverer than reverting to Daedra worship, because then Dark Elves become your stereotypical servants of the Lords of Misrule, and cleverer than adopting the Imperial system, because that would be boring.
However, I like your idea about renewed interest in the Imperial Cult, especially in Akatosh and Talos as people now can resolutely say that the Aedra actively do protect them.
Depending on the nature of how the statue of Akatosh closed the gates to Oblivion depends greatly on the permanency of these new barriers. In the extended lore (don't know how much you know on the topic), the statue could've just replaced the gem of the White-Gold Tower, essentially meaning that if another tower were to fall, then we'd have the same problem on our hands. The statue also could be something mythically new. Not likely considering the non-chaotic nature of the Aedra, but anything's possible. This way, it'd be hard to tear down the barrier again. And then, the statue could be its own Tower and gem. Sort of like Akatosh taking on another role as protecting Tamriel from nonlinearity and now also from marauding Daedra. Again, it'd be hard to reopen the barriers this way.
You should stick around and/or post more here OmegaX. You look like you can contribute something to our conversations. Although we'll see once you finish reading the requisite expanded lore, if you haven't already.