I think if there had to be multiplayer, they should do it in a sense where you can only play with one other person, and that's it. There could be a cute little chat system and what not I think it'd be interesting to see how people can get along with one another. Of course there's plenty of drawbacks and dead-weight to this. Like what happens if one person leaves? What happens if one player goes through the teleporter while the other stays? Just a lot of unnecessary work for a feature that a good majority of the community would be totally against. So let's just have the best single player experience we can get!