It's been over 3 years since we have had a mainline Halo game. At this rate it may even be a 5 year break.
It really SHOULD have a BR mode...
50 v 50 isn't fun. Squads of 4 would be great. But 343 have literally gone on record saying no BR for infinite.
I also don't understand people saying they are sick of BR. Look at blackops 4. I hasn't detracted at all from the normal MP. Just now it has another excellent mode to the game.