Great thread but its an easy bet, there is no way its doesnt sell 20M in 2015 with much more big games and bigger games than 2014, with 3rd party games Alone, it would reach 18M considering it will reach 16M for 2014, so if your add Japan + china + first party games/ PS exclusived + a possible price cut, 20M is a given , its could reach 21-22M
Predictions for end of 2014 HW sales:
PS4: 17m XB1: 10m WiiU: 10m Vita: 10m







