A lot of hard core gamers will get all systems in a particular generation because they have to play all the games exclusive to each system.
I think this time around most of those people will be put in a position where they will end up choosing between a PS3 or 360, because of their higher pricing.
So it will be a choice between a "Wii and 360" or "Wii and a PS3".
Either way, Nintendo wins.