Meh, its a debate that crops up every now and again, whether the Wii will outsell both the other two combined
And it is also of importance for the reason you said - games for the hd console have to be significantly downgraded to play on the Wii, just as Wii games have to be significantly downgraded to play with the HD consoles controllers. So in a sense a developer has a choice of making a game for PS360 or for Wii