If it is possible to easily make a game multiplatform (as Guitar Hero undoubtedly is), why wouldn't you put it on as many systems as you can? The Jackal is right; the producers would have to be stupid not to put it on the Wii. From a business standpoint, it's a no-brainer. The Wii has a large market. Specific controllers are already needed to play the game, so trying to adapt the game play is a moot point. They have nothing to lose and everything to gain.