Xbox One to sell a billion units (Says Microsoft)

[Slidell]

 "We think you can go broader than a game console, that's our aim, and you can go from 400 million to potentially upwards of a billion units. That's how we're thinking of the Xbox [One] opportunity as we go forward."

 

http://www.digitalspy.com/gaming/news/a484596/microsoft-predicts-1-billion-xbox-one-sales.html

 

So, basically, everyone you've ever met will own one, everyone in the US and Europe will own one. Unless you're assuming one per household, then it's probably, everyone in North America, everyone in Europe, everyone in South Korea, and everyone in Japan.