The 360 has seen its best day... I beleive the PS3 has seen its worst. When the price comes down we will see a WW shift and the PSWii will become far and away the most popular format. The PS3 will pass the 360 in holiday season 09.
End of 2009 Predictions (Set, January 1st 2009)
Wii- 72 million 3rd Year Peak, better slate of releases
360- 37 million Should trend down slightly after 3rd year peak
PS3- 29 million Sales should pick up next year, 3rd year peak and price cut