it would be cool if you could play skyrim in co-op mode on xbox live

How would this even work? No, on the grounds of practical impossibility.

This is NEVER going to happen for SO many reasons

1. SKYRIM! IS! DONE! IT WILL NEVER BE TOUCHED EVER AGAIN BY BETHESDA! how hard is it for people to understand, adding something to skyrim comes up at LEAST once a month

2. It IS NOT that kind of game, and was never made to

3. There is literally no possible way to make it work. someone TRIED REALLY hard to get it to work by making a mod, and failed miserably. The engine, the system, teh code, literally none of it was made to be able to gon online

So, Not only is it literally an impossability, even if it was SOMEHOW possible with A LOT of work, it would never happen anyway.

Wow. I haven't seen one of these threads in weeks.

We have a thread for all discussions of non-MMO multiplayer in TES games.
http://www.gamesas.com/topic/1366657-non-mmo-tes-multiplayerco-op-thread/