I feel like most of you clowns didn't even ready the "Great War" book you can find in Skyrim. Here is a link:
http://www.uesp.net/wiki/Skyrim:The_Great_War
I'll make the following points:
1) The current Emperor is a strategical genius.
2) Hammerfell refused to sign the White Gold Concordat and the Empire had to allow them to cecede or risk an on-going war. At the end of the War so many people wanted peace that had a treaty not been signed, civil war would have erupted across the Empire and not only in Skyrim.
3) Hammerfell resisted the Dominion on its own for 5 years before forcing them out.
4) Ulfric probably believes Skyrim can do the same.
5) Titus Mede II and everyone else knows that the Empire needs to be rebuilt before they can actually win a war against the Thalmor vs. end in a stalemate.
That's why when you read the dossier's found in game you see the Thalmor as conceding that they need Skyrim to stay at war for a long period of time so that the Thalmor are able to rebuild at a quicker pace than the Empire.
This is all a war of attrition. The 1st to be able to rebuild and go on the offensive should win the next war.
I should also add, that the reason the White Gold Concordat was signed is because the Empire WON the war. Had the Thalmor won the war, the Empire would have ceased to exist. Read your history folks.