We dosn't know the price of ps4 we don't know the full line up of ps4 we don`t know the strength of the competition between the big 3 if ps4 will have dificulty it will not happen because of smartphone and tablet.
PS4 - over 100 millions let's say 120m
Xbox One - 70m
Wii U - 25m
Vita - 15m if it will not get Final Fantasy Kingdoms Heart and Monster Hunter 20m otherwise
3DS - 80m







