U said that bungie did not use headset cause xbl live was not available yet. Knowing bungie (or hope i know them) i think that they will want to use this tool in a innovative way use the maximum possibilities this thing can do such as in one player mission, give order to marines to move next to a thing or other thing like throw a frag like in rainbow six 3 (i thing the chief in the demo give a marine the order to throw a frag after bombarding the big plasma bomber or thing like that in the dark places fill with covies) or tell to a longsword fighter to bomb an area like the general do to blow that thing !(it can be nice) In multiplayer(xbl) they could use it as a thing to: First, contact your team and make strategies, it could be good if we can talk to 1 person at time or all your team Second, allow u to call help from marine that i hope will be in multiplayer to give some additional action.
please give your idea somebody important could read it and take hint to make halo2