Wrong. Ulfric reminds me of Hitler and germany's reaction to the Treaty versailles, Its the same with the White-gold Treaty, They complain and whine, Dispite the fact that the Thalmor would have killed everyone else if the treaty was sighned.
Hammerfell left the Empire and drove out the Aldmeri Dominion. Why do you seem to think such a thing is impossible for Skyrim to accomplish as well? Why do you think Skyrim
absolutely has to be part of the Empire,
no matter what? It doesn't matter what Ulfric wants. Even if he is the face and head of the rebellion, his actions or beliefs do not condemn every Nord in Skyrim fighting for independence.
The Aldmeri Dominion would have defeated the
Empire, not
everyone. Even though the Empire signed the WGC, both sides were left devastated because of the war. If the Empire granted Skyrim indepedence and convinced Hammerfell to join them as an ally rather than serve them, they might actually stand a better chance against the Aldmeri Dominion than if they were to continue a civil war and ignore Hammerfell.