It must be said that out of all the greatness that is Skyrim there is nothing like sharing your adventure. There are certainly many great MMO and MMORPG's out there. What I propose is most likely impossible, but gives me a great thrill to consider:
This concept (in my mind) includes combat against other players' characters, having another player as a companion, multiple dialogue options as seen in Star Wars the Old Republic, and similar multiplie player attributes.
I am not savy in the ways of design, however, I have a vision in which Skyrim's massive world, with an experience unique to each player, be shared, not through just talking, blogs, etc., but in the game itself.