To extend your analogy, you'd find that things you'd always taken for granted no longer worked, like the steering wheel. MP would have to be so far removed from SP in gameplay that it wouldn't be the same game. Sure, the ideas of Bethesda wold be as good as ever, but there'd have to be some major modifications. Imagine all five of six players sitting twiddling their thumbs while the sixth was in his inventory menu deciding what shirt to wear! Even something as simple as a LAN co-op (definitely too much scope for irritation with MM) you would have to have it on almost a quest-by-quest basis, as even the most determined team would find it hard to finish the main quest in a session! Perhaps if the engine recognised MP as being seperate to SP... eg your character joins a game with "Fred" and "Jim". Fred and Jim see that Bob has just got in from Solstheim, and the engine compares each player's progress and initiates quests that fit with where people are in the game. A player's own inventory is also imported (and yes, you could take items from one environment to another). The MP quests might have no impact on an individual's main quest in SP, but it is a chance to get more loot/experience etc. Then, when Bob decides he's got to head off to work, Fred and Jim see him boarding a ship back to Solstheim or wherever. I have quite enough fun playing SP, but all the same, it would be nice to invite someone into my world and show off my character! ;)