There`s no way XB1 will sell that much when 2014 is over.
Having great titles or 3rd party support won`t make it reach those numbers with a 499$ price tag, PS4`s popularity and, who knows, Wii U`s rise (steady release of exclusives). Not to forget it is yet to release in several European countries and Japan.
Not saying it will do Wii U numbers, but i wouldn`t be surprise it sells about the same as Wii U next year.