Let me start by saying I enjoyed TES:O because it was a single player game. I wasn't looking for a MMORPG experience from the TES series. I think a TES MMORPG, if ever made, should not (NOT) be instead of a traditional SP TESV.
However, I would like to see some form of limited MP support in the next TES game. Nothing fancy, just some way for maybe 4 friends to LAN it up and crawl some dungeons together.
This wouldn't effect the story, as TES games tend to have rather optional story lines .
Could effect balance though, if a dungeon is designed to be taken by one character having two could be too easy.
Thoughts? Comments?