The 360 can't come in first for the same reason the PS3 can't come in second: they just can't outsell its competitor fast enough.
Bringing out my old troll.xls, for the PS3 to catch the 360, it would take the PS3 outselling the 360 by 53,000 weekly for 3 straight years!
Unfortunately my handy little spreadsheet isn't setup to look at the 360 and Wii but considering the Wii has a good 20 million lead on the 360 as opposed to the 8 million lead the 360 has on the PS3, well, you can just guess it isn't going to happen in any reasonable amount of time.
-edit-
Note that I'm not bringing the PS3 in this to try and troll the thread, just bringing up the fact that if it's pointless to think the PS3 can come back from being behind by 8 million in a reasonable amount of time, it's certainly pointless to think the 360 can overcome the Wii's 20 million lead in a reasonable amount of time.
A lot of people just fail to see that this generation was already decided a good while ago who fit where in terms of sales.
