We've only done the first 3 chapters. We don't know what will happen next. Lots of things can happen to shift the balance of power back and forth pretty much indefinitely, given how fare away we are from known history.
I really hope so. I think the Empire players deserve some canon victories, enough to make sure the Empire remains for a long time yet. It won't do the game good for one of the two sides to be losing badly. At least make it a stalemate.