If a game is planned from the beginning to be a multiplatform game, that's a-ok with me. However, Epic Mickey was made for the Wii after making the game for 360/PS3 was dropped. Deciding more than half-way through development that HD versions need to be made spells trouble. What does that mean for the Wii version? Would Warren Spector have to divide his attention away from the main Wii version? If he doesn't, will that mean the other versions will suffer?
I just think it's better for Disney/Junction Point to focus on making this game the best it can be and since it's already on the Wii, make it the best Wii game it can be. Considering other versions at this point is a distraction and not worth potentially delaying the game or causing problems with the Wii version already neck deep in development.