I'm thinking down the line here, it might never happen, but I thought of a different location besides the provinces. This trip was made before by a wizard by the name of Morian Zenas. If you know a bit of TES lore you know where I'm getting at.
What if a TES game took place in the realms of Oblivion:
Mehrunes Dagon's Deadlands
Sheogorath's Madhouse (The Shivering Isles)
Malacath's Ashpit
Boethiah's Attribution's Share
Molag Bal's Coldharbour
Meridia's Colored Rooms
Hircine's Hunting Grounds
Hermaeus Mora's Apocrypha
Azura's Moonshadow
Namira's Scuttling Void
Peryite's Pits
Clavicus Vile's Realm
Sanguine's Realms
Vaermina's Quagmire
Nocturnal's Realm
Mephala's Web
The player would go through the several realms of Oblivion, in an adventure reminiscent of PlaneScape: Torment. Not sure if you would be the person sent into the realms of oblivion, or if your one of the denizens. But for a story to take place in the realms, would mean something big was happening. Greater then the gods themselves.
We would be able to put our eyes on all the realms we haven't visited. Besides the Mehrunes Dagon's and Sheogoraths. Not including Peryite's and Boethia's , his should be different from Dagon's. And not only that, but you could also get a look at Jyggalag's realm in place of Sheogoraths, and the next coming of Sheogorath? You would figure out the mysteries of the land, we could find out exactly what happened to the Dwermer, and what happens to Dead Gods. And possibly kill some gods on the way. Possibly become a god! The developers and writers could expand on the lore of the gods if this took place in the Realms.
And possibly run into Aldera. A war between Deadra and Aldera, consider that.
This is just an idea of mine, and for you guys to discuss. I would be happy with a new TES game anywhere, I just wanted to know if you guys considered the realms of Oblivion.