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This is a tricky idea as it would be hard to pull of for Halo, so here is how I see it working. Not quite like Destiny or as big as Destiny, but more similar to Dead Island where you have quests to do and people that you can rescue. You pick up weapons found around the world and can give them modifications including more ammo in the mag, camos and attachments for ou weapons such as scopes, flashlights and knifes that you can add for a more deadly melee attack. Unlike Destiny, I can see players trading gear with other Halo players in this world, why not? In this game you could drive Warthogs, Mongooses and stuff, but you could also drive and modify civilian vehicles so it becomes faster and stronger. Amagine driving down the street and running over Grunts in a pimped out Warthog or Civilian Car. Now the best storyline scenarios that I could come up is that your a Marine/Cop or just any other civilian that is trying to escape a ravaged human city occupied by the Covenant or just survive in that very city as their might be no way to escape. In multiplayer, like Destiny you bring your gear with you into battle and the Multiplayer would NOT be canon as MP canon is pointless. Firefight could be a part of something like this. You and your fellow survivors have found your hide out and you want to keep them out and survive as long as you can. If done right and if made, this could be one of the most loved Halo titles.