Board Thread:Lore Discussion/@comment-107.15.194.254-20150824050409/@comment-26600409-20151103141722

the fact of them elves regaining their immortaility doesn't need to be necessarily true but it's what they believe will happen and i can say from this quote

http://elderscrolls.wikia.com/wiki/The_Towers|

thalmor end game

The "Sons of Talos" or Men are also seen as an obstacle, so they seek to remove Man from the equation. Simply killing every human would not suffice, rather the very notion of man must be eliminated. This would be achieved by deactivating the aformentioned Towers that hold up Mundus.

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By this qote it is still very plausable that their plan is to get rid of the notion of man completely with the rest of nirn so them wanting to get rid of the towers is a very logical step taken by the thalmor in this area