Your next Halo Game…should be an 8 Player Co-op Campaign Story Driven Game based on the Halo Lore that is already written.
Scrap the Multiplayer. Spartan vs Spartan is old and tiring. Get rid of it.
Have an 8 Spartan Player Team battling against the Brutes, Floods and the Endless.
Revamp your open Halo World with a living city of surviving Ancient Humans and Forunners.
Use Black Hawk Down and Band of Brothers as an example for a Halo Tactical First-Person Shooter Game.
343/Microsoft…i hope you are listening to new ideas. If not, Halo is doomed.
I wish you the best.