i dont think it will sell at $149. i think its going to sell at $99. ms is aparently going to market it like its a new console so that should help. if they have a lot of good games for it then i think it will succede, and sale alot of units.
Halo MCC will sell 5+ million copies(including digital)
halo 5 will sell 10 million copies(including digital)
x1 will pass ps4 in USA, and UK.