The Thalmor and their ideological aims are directly related to the theme of Alduin eating the world, the conflict between Shor and Alduin.
A Mythic Dawn copy would blow, but they don't have to be that. They could be presented nearly anyway the writers can think of. I honestly don't have any ideas, but I'm steadfast in my assertion that they could be incorporated, and arguably should. I'm tired right now and don't want to have to think; maybe later I'll try and come up with some possibility that you guys would find acceptable.