So, planetside type game in the halo universe...but better.

[mavox]

Planetside: Combat Evolved


Planetside: Combat Evolved lol
Just tons of dudes battling over a ring in the middle of space. [/size]
Here's the pitch, you have a ring, its lets say 1.5 kilometers wide and 20 kilometers long(rough guess)
Objective based 24/7 battles. 
Quickly move to objectives. You can fly to any point on the ring at any time. So take off in a troop transport or a banshee and fly completely vertical until you hit the other side of the ring to capture an object,ive there. The whole time dogfighting is erupting in the space between the ring world. You could even look upwards and see battles for objectives happening in the distance. It would look similar to the 2nd mission in Halo CE, except total, full blown carnage. 
Classes
HUMAN Mark 4 spartans(Jorge/John 117) for tank classes and spartan II for faster lighter variants(jetpacks/snipers)
COVENANT Elites as playables, different variants of Elites, Rangers/specters for lighter classes, Generals for tanks.
PROMETHEANS Knight variants as playables
All with their own vehicles, abilities, and unlocks. 
Imagine the insanity of 1000+ players with halo-ish(modified of course) gameplay. With troop transports, fighter jets, and supporting AI all battling for each faction.
AI marine support for spartans, jackals for convenant(fodder like Titanfall) once you capture a control point. 
Special class(AI commanders): 
Spartan, Elite, and Promethian Knights  for each faction that can direct ally AI to defend and assault specific points. They can only use sidearms and have virtually no armor. Must be protected.[/size]
 
Using the cloud and the halo universe people are familiar with could be something epic. [/size]
Planetside 2 has no story and the gameplay is below average at best, and MAG had terrible UI and controls with no story, However they both seemed to have been able to pull them off technically, despite the issues. 
I think with the cloud tech and everything else I've discussed out, this could take Halo to the next level. An option for people who want to play halo on a grand scale, I mean halo is scale if anything is, We just haven't experienced it like that yet. As an added bonus this could pull in a ton of PC gamers. Just an idea, I can dream.
 
Now, this would be a spin off of halo, not take over the halo fps squad gameplay that many love.

[TheBritishSpartan]

I suppose it would be fun, Though it wouldn't feel much like halo just a new IP with halo assets. They would need to make sure they don't remove the core of halo.