Don't we have this sort of thread all ready? BTW: They will NEVER remake games.
You are right in the way that they would never RE-MAKE a game.........but thats not what the OP is asking. He is saying that an expansion could be in another region.
Now on one of the Bethesda Podcasts Todd did say that he is not against returning to a region as it would have changed during the timeline (Just think at what Vvardenfell would look like 200 years after morrowind with all that has happened there.)
But in response to the O's original question I voted other.
I am not against the large DLC, I just prefer little things added to the game - one of my big 'wants' is armour and weapon stands and the ability to knock a NPC unconsious, I have tried playing without killing and its currenty a non starter for TES games. Its not that I done want to kill, its just another Character that I can explore.