1. You can hunt down the Thalmor in Skyrim solo.
2. Tulius is a general, not some impulsive teenager. He isn't stupid. The empire would get stomped by the Thalmor without Skyrim. And Skyrim would get stomped without the Empire.
3. The blades hunt them down? Delphine and Esburn? Esburn is old, and Delphine is..stupid. And the Thalmor wiped them out rather easily.
1. Ya, but it's not official/ you will have to deal with fines, guards, etc And they will keep showing up. Quests to do it would add some fun and actually make it matter more.
2. Agreed (on the general, teenager part), but with two forces baring down on them, the power (or whats left of it) of cyrodiil and the might of the nords would easily hit them hard. Just look at how Hammerfell held them off...
3. You can recruit for them, can you not? Let you get some more people hired, trained, etc. The cap is 3 now, but that could change. And the blades faught them before, like spies from the cold war. You're not trying to end their society, just their grasp on Skyrim.