only prediction I will make is July will be the PS4's worst month in 2014(Holdover launch demend through April, Watchdogs May/june bump, TLOU/Destiny bumps from here on out)
..... and it will still beat XB1 handily.
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