Bethesda has already said they are planning on releasing several smaller DLC's instead of big one's like Shivering Isles. Personally I would like to have both, but we simply can't have it all.
After 7 months, I expected something more from DG. Of course Bethesda would like to have 4-5 smaller expansions instead of 1-2 like SI, Tribunal or Bloodmoon. At 20$ a pop, they will earn more than releasing two fully fledged expansion for, what? 30$
Back when Oblivion came out, I skipped all the small DLCs because I felt they were not worth the money. I intend to do the same with Skyrim. Being on PC; it's not that I don't have additional content to play with...