The problem is 3rd party don't want to make AAA game on it if Sony can resolve this problem i'm sure vita still had the chance to get a big revival
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







