Yeah and the shivering isles was said to be roughly a quarter of the size of cyrodiil which is no small pigeon.
Yet Summerset isle is bigger than a "Quarter" of Cyrodill and also Shivering isles wasn't a dlc. It was a full blown expansion. Dlc are things like KoN and Wizard's tower. For those who say "Such place is too dominated by one race" No it's not. Morrowind was dominated by dunmer but there were still other races. 90% of the npcs you ran into were dunmer but you can do the same in black marsh. 90% of the inhabitants will be argonians for instance.
Also to the whole "I wish all the provinces were in" I don't. Daggerfall was a decent game but everything was too generic. You can't have everything on an engine like Gamebryo without downscaling everything severely. I like how they focus on one province at a time and why does the series need to see a close? Realize so far we've been on the same continent. Tamriel. We haven't been to the rest of the continents yet and there's still many provinces to go before it becomes redundant. Also there's no need to close TES when it's the only open sandboxy rpg out there. It has no competitors.
On top of that they didn't make New Vegas. Obsidian did. They only made FO3. They PUBLISHED New Vegas. Likewise, they didn't make rage either and rage was developed by ID Software. Again, published by Bethesda. So the only apocalyptic game made was Fallout 3. So where are you getting that they've been moving towards dark apocalyptic?