[Blasterpez]

like kona says, there are plenty of spin offs from halo that can keep that game world going.
also, as long as the demand is out there and people are will to buy, i don't know why they would stop.
or they can george lucas it, and keep releasing the old games again and again, until they meet the creators vision (heard he wanted to do the original trilogy AGAIN in 3d now). Fans will buy it all....i did.