i think 3D didn't work because most movies didn't use it well ,and motion control worked only 1 generation because they were bought by casuals gamers why would a casual games bough another console with motion control when they already have a Wii.
I think VR will attract hardcore gamers and not casuals so if it used well i don't thnik VR will die
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







