Bethesda doesn't like adding on to Elder Scrolls games.

I read that the Skyrim team was closing up shop, and thought, "What? After only two add-ons?" So I looked up how many expansions Oblivion got: also two - Knights of the Nine and Shivering Isles. Then I had to look at how much loving attention the Fallout series got from Bethesda after they took it over. Fallout 3 got 5 add-ons and Fallout New Vegas (puh, puh, wipes taste out of mouth) got 4. So now I know where Bethesda's priorities lie, and I will adjust accordingly.