How many time Sony say they don't has any attention to drop the price they tried to boost the sale with games.
The price drop it's the last thing Sony think about they will not cut the price in 6 month like Nintendo.
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