Do you think the games are heading that way?

In Hammerfell, the Redguards pushed the Thalmor away , now in Skyrim the Stormcloaks revolt against them and the Aldmeri dominion.

Do you think that the last ES game based in Tamriel will be about either joining the Thalmor in order to save them or destroy them for good?

I doubt it. For all we know we will go forward 2500 years in the future for TES 6, and the Dominion/Empire feud was finished long ago. Not that it wouldn't be interesting, but I don't want to see it drag on to be honest. A TES game comes out every 5 years, do we really need a whole decade(or more) of Thalmor?