I think it would be a good Idea and add more varity into the game and be quite fun to have a full party of your friends in a game just messing around and having fun.
Anyway, the co-op thread for Skyrim is http://www.gamesas.com/index.php?/topic/1150059-the-engine-and-possible-co-op/. And have a http://images.uesp.net//c/c4/Fishystick.jpg
Skyrim is a single player game. Please feel free to discuss future TES multiplayer/co-op in this thread: http://www.gamesas.com/index.php?/topic/1119156-official-tes-multiplayer-thread/