4.6 million Xbox
4.5 million PS4
3.1 million switch.
This is dependent on a 250$ switch and 399-449 Scorpio. If higher prices than less for each console.
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.