How about creating Elite and Promethean Specializations packages, and allowing players to play as Elites/Prometheans, each with their own unique specialization packages to unlock. Although apart from Promethean disappearing acts, and Elites active Camo which lasts some 3 times longer than Spartans, I have no idea what other Specializations to add. (post your ideas for Covey/ForRunner Specializations)
Then on maps instead of Red vs Blue teams you’ll have players playing as Elites up against Spartans/Prometheans vs Spartans.
Personally, I think it would be a nice change of pace to play as a weable wobbling, spawning in and out of Spartan gun sights Promethean.
No voting, just post your reasons why you’re either For or Against the idea as feedback is probably all that will ever come from this.