Wouldn't it be a moot point anyways?
I was under the impression that the outcome of the Civil War wouldn't matter outside of Skyrim since, y'know, it's a civil war. Well, other than the fact that the Empire loses another Province, anyways.
It would be hilarious if it turns out the Dominion's influence grew even more powerful, though, and no matter who won the civil war, the Dominion would go into Skyrim and take over again.