A lot of people across the gaming internet gonna miss the + part lol. Safe to say XB1 will finish the gen at 50 mil.
If you're going to count wiiU then also count the switch against next gen consoles, that would put Microsoft automatically last place for next gen, no way they could ever catch up to switch which will have at least 60 million already sold by the time xbox series X lands. Or you could say the switch is part of current gen, as its likely Nintendo will make a switch 2 in the next 3 years. And it would mean Microsoft came last this gen. Either way, Nintendo wins.