Wikipedia says 58 Million which is still less than half of what ps4 did, Numbers inflated by old folk's homes that bought it because of the kinnect lol.Well, Xbox One did around like 40 to 60 million consoles, right? That’s a lot of people who wanted a high tech, stationary console, so going to Nintendo isn’t likely.
Xbox players will most likelly flock to PC, i'd say about 35% to 40% will go to playstation. Nintendo is living in their own anti-consumer world, doing their own thing with their masochist fans so it doesnt affect the formulae too much.