Bungie guys are really rubbing it in by throwing up videos for older Halo multiplayer.
Halo 2 anniversary Multiplayer needs to happen. Make it like Counter Strike Go but dont even bother polishing it that much. Just port it over, maybe get someone to do a cheap gfx update on it and maybe patch the glitches and put it on the XBLA markerplace as a multiplayer only game. Go for the cheapest route possible to cut costs.
If the netcode held up well back then surely with everyone having better network technology now it will still hold up well? Im guessing the smaller sandbox/ cheaper in game resources mean the game is less prone to lag? Im no network engineer but I imagine a game like Halo 2 wont require half as much work on netcode as a game like Halo 4 does. Is a straight port possible there?
I guess with Halo CEA they didnt want to split the userbase and so on... but theres no need to even waste money marketing it too much, just put it out as a treat for the hardcore fans. Market it in that way and make it clear its not supposed to graphically beautiful or add anything new, be bold and proclaim it as a game for the nostalgic, it will still recoup its costs if its made cheap enough.
Its never going to happen.