Hmm... Can't his dad simply cut off his money? That would make it very hard for Dorian to stay on. He should stay, though, and try to make his own life separate from his dad. Will be hard, with him in the race to be vice president.
Although, right now, I'm not sure he should stay if he can't leave that room... It could turn really ugly. I would go nuts if I had to live with someone like that and not be able to choose for myself who I shared a room with. A strange rule, I think, but it has its reasons, I'm sure.