I think with Skyrim, this is what bethesda was going for. They wanted to release a couple of episodic content that was fully featured, and then move on. And as with GTA, they could of continued to make DLC and they would of made alot of money, but have since moved on, as has now Bethesda. I am also discounting Heathfire in this, I don't think that qualifies as high quality DLC myself.
If they were to continue like this in the future, would you guys be happy?