I think supply scarcity throws a major wrench into VGC projects that is why I don't know how accurate that PS4 number is. For instance this holiday there was a week when Walmart was reported to get a huge shipment but not many other retailers got any, if VGC does not track Walmart in there data they would not reflect those sales accurately, the was another week that Best Buy Target and Amazon got huge shipments so the same is true, VGC had data on those retailers but not Walmart whom did not get many they week they would over track because they would extrapolate those sales to other retailers who did not get supply.
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
