I expect Halo to lose steam due to how oversaturated the FPS genre has become.With Destiny still kicking and BO3 and BF obviously being the bigger shooters this fall it takes away from the impact that Halo could have had,plus let's not forget that when Halo 3 released Live was still the leading online gaming network and PSN has taken the throne since then.
BTW I told people that BC in the X1 would not change the sales landscape.Where are all those people who said the X1 had an advantage because you could play a few 360 games on the X1 now?