i just think that with all the content that halo has (weapns and vehicles wise) this idea could work all that would be required is making up planets and mild back stories and boom you've got a full blown halo universe where the humans and the covenant are fighting for supremacy. and honestly who doesn't love flying around in the banshee's and the hornets from halo 3, toss people into space fights like the one mission on the reach mix the two aspects together and you have a killer game