I just saw on Neowin a report of an interview fielded by Acti's CEO where he states gamers want to pay a subscription to play CoD "World":
Kotick said:When asked what he would like at the snap of a finger, Kotick said "I would have Call of Duty be an online subscription service tomorrow. When you think about what the audience’s interests are and how you could really satisfy bigger audiences with more inspired, creative opportunities, I would love to see us have an online Call of Duty world. I think our players would just have so much of a more compelling experience. I think our audiences are clamoring for it."