Slightly Live
Dirty tag dodger
Plus, F2P mp with a bunch of DLC would require the creation of new assets. It makes the most sense to just sell the game as is and pull in as much cash as possible.
I see where you are coming from, but that does not necessarily mean they need to release a Halo title for launch. Halo 2A would be great launch title, but if MS feels they do not need a Halo title to meet their hardware sales numbers for this year I could see them skipping a year.
If they use Halo 1 -3's multiplayer, they could chop that all up. Give you Valhalla or Blood Gulch for free along with default armour and gun skins. Give each gun a few skins each, charge per skin. Same with armour, charge per armour. Charge per level.
Plenty of money to be made and fans can just pick what they want too. Only want Valhalla and The Pit and Recon? Just buy those. Plenty of game are going FTP, especially multiplayer and I think Halo would be prime for it.
You could easily have a FTP Halo re-using existing content and piece-meal out the release of said content and literally have a "new" game on the market, with a steady income, with a ton of features, tons of players and not have to create any new assets at all for like 2-3 years.
How many maps are available for Halo games on the 360? That is a shit ton of content you can re-package and sell.