The PS4 could not meet demand last holidays so it's jan-mar were bolstered by unfulfilled demand. The XB1 was easy to find holiday 2013 so the fact it only had a 7% increase is bad. This year the XB1 has nothing for the next 7-8 months where as last year it had Titanfall in March and Un bundling in June. At a 150 dollar cheaper entry point than a year ago one should expect a much higher baseline than +7%.
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