If the theory of the Thalmor's ultimate plan is to undo reality by removing the gods is correct, of course.
I can't recall the local names, but aren't the natives of Akavir reported to worship an aspect of Akatosh? And if they worship Akatosh, would they worship and other of the Eight Divines? (I seriously doubt they even know about Talos)
So, if the Thalmor do want to extinguish worship in the gods, wouldn't they only be half-way done if they succeed in Tamriel?
And while we're at it, could they even invade Akavir? We know how disastrously terrible it went for Uriel V... And that was during the long climix of Imperial power.
Would they ever be able to invade Akavir? And then move on to remove the gods all together? How could the Dominion do a better job than Uriel's Legion?