So i had a few Ideas on what Warzone 2.0 or up could be like.
First off 50 vs 50 combat. Obviously More player in general would be great but there are lots of game right now that can hit 100 player while still having AIs as well so i think it’s something 343 can do in the near future. The maps would have to be at least 3x as large as the one in Halo 5.
More AIs, they should also do more than just stand in one area. The AIs could raid Spartan bases, not capture them like the enemy spartans can, but force them to spawn outside the base. They would have to deal with them when they attacked or clear them out after before they can spawn inside again. If not that they should at least roam around the map
Vehicles and weapons on the maps. The Vehicle Pads from halo 4 should come back. They would be spread out over the map and they would have fairly long cool down times. You would use Req points to summon them just like you do with normal reqs. Their could also be weapon crates that do the same thing. Over time these Pads/Crates could upgrade. AKA a ghost pad that activates at 3 minutes could upgrade to a ghost ultra at 12-15 minutes. This would help people with less req cards from being at a severe disadvantage to people with lots.
More types of Capturable bases. I think there should be more than just UNSC UNSC and more UNSC bases. They should have map with Covenant bases on one side and UNSC on the other or Forerunner and Flood. Instead of just Bases there should be capturable Weapon emplacements like an Anti Air Gun, mega turret, or a MAss Driver. There should be Massive capturable Vehicles Like the Vulture, Mammoth, Lich, or even a scarab. In warzone assault the attacks could have one of these Vehicles and the defenders could have Weapon emplacements, an energy Shield the attacker have to take down, or even less powerful vehicles that work well against the attacks vehicles(wolverines, AA wraiths, Cobras, Locusts or aircraft like the Seraph and Longsword).
Different spawning methods that cost reqs. You could get an ODST drop pods req that lets you drop in any areas that your team has captured. Maybe a Halo Jump req that Lets you skydive to any part of the map, but you would be falling significantly slower than the Drop pod and could get shot down. These are the only ones I could think of but I’m sure there are other ways you could spawn in.
Being able to forge Warzone would also be great. You would basically be able to make you own campaign missions at that point.
Space battles. I’m not sure how this would work with REQs. I guess they could make it so only air vehicle can be spawned or vehicle that can work in space… Other that all the other ideas could still work with this it would just be in space. Ships as bases and maybe asteroid, or space station as capturable bases or weapon platforms. Spartans could also be able to fly around in space with just the thrusters in their suits.
These are just My ideas and I understand that implementing all of this is probably not going to happen. However, some of these ideas could be put be put in Halo if not in warzone maybe in a different gamemode at some point.