DLC like extra levels should always be free, PC gaming has been like this since ages. Even Assassins Creed Brotherhood has free DLCs, I approve of that.
If its not free I ain't getting them.
Free DLCs definitely help to increase a game's longevity, eg. Gears of War 1, it had free DLCs and I loved it so much.
Gears 2 automatically sucked and although I got free DLCs for it(GOTY version), it wasn't worth it at all. But that's a different issue.
CoD is for people who don't care about money. So, the first place where CoD will perish will be the PC.







