too high on PS3, too low on 360, too low on wii.
only one system seller exists on the PS3 now, that being Gran Turismo 5, which will sell at least 7 million copies by end of 2010. it's also far too early for a price cut, and it remains to be seen if the PS3 can sustain it's momentum after the holidays. i expect PS3 hardware to be around 13.5 million.
natal will have some sort of effect on 360 sales, since i'm sure it'll be put with some kind of bundle/price cut. the 360 is ripe for a cut, and could see it taking over the holiday season. i expect the 360 to get around 12.5 million.
wii.. well, there's no reason why it will suddenly undertrack itself, other than the other motion controllers coming out. i'm sure there's a giant game planned for the holiday season aside from zelda wii and mario galaxy 2. another wii sports+ type game? i expect wii sales to be at least 23 million.