It's been more then 1 year since to release of the ps4 i think they could do a 50$ price cut without losing money but i don't think they will
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