I think it's likely that Rock Band won't do as well as the PS3/360 versions, but it should do better than the PS2 version. Probably 500k by the end of the year. Now they probably won't do DLC or any of that stuff, but I don't think that'll effect the majority of Wii owners, since there are fewer Wii owners online then there are 360 owners, and probably PS3 owners. I don't think that they'll release a disc of more songs for the Wii version, because I just don't think people will buy it.
With Rock Band 2, I could see the Wii version doing a lot better, and though maybe not beating the 360 version, it'll probably hands down beat the PS3 version, and it'll include all the features like online play and such, and it'll probably also have DLC since Nintendo will finally have a solution to the storage problems and such.







