Sorry but we can't Judge with just one generation maybe the next will surpass the generation of psvita and 3ds and how can we know if people who buy the last generation and dosn't buy handheld in this generation goes to smartphone?
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







