As I recall, Microsoft tried a 'pay to play online' thing with Windows Live, and one game that used said pay-for-online was the PC version of Halo 2. As far as I know, it went belly-up.
I already think it's bad that they're making people pay for the XBox Live Gold to pay online (How can the 360 players let themselves get spoon-fed that crap!? As far as I know, the XBox was the only console to ever make you pay for online multi-player services in recent memory.)
I don't see how Activision can possibly think that making us PAY for something like dedicated servers, that some people will ALREADY BE PAYING TO HAVE THEM RUNNING would ever be a good idea. Especially after Microsoft already tried such a scheme and failed.
I'm fine with microtransactions; they're like little expansion packs. They aren't normally in the game, and you pay for the extra content in smaller chunks. Paying for online multiplayer, though, is charging people for something they are supposed to already own right there on the disc, and it disgusts me.
MMORPGs, as much as I hate them, are the only excuse for Pay-2-Play online. MMORPGs are massive, persistent worlds that need to host thousands and thousands of people each all at the same time, as well as handle all the monsters, quests, player stats, items, communications, and the countless other things. Any player simply DOES NOT HAVE the resources capable of sustaining, or even creating, such an epic-capacity server, and it costs the company a lot of money to maintain their servers for those games. They are in a whole other league as far as online goes, and the subscription is well within reason there.
Paying to play shooters online with maybe 15 or so other people... anyone can go buy a gaming server and set it up the way they want. Running such a thing is nothing special, and Activision is under the delusion that they have the right to charge players such a basic service.
if the P2P IW.net didn't piss off every gamer on the planet (Which is understandable; if they like it, then that's fine. Even if I utterly despise it, that's more a personal issue than anything), I would be very surprised if Activision had anything over 5% of their PC user-base left after they tried to do that. And if they did manage to keep a lot of their users... that would be so embarrassing and telling of humans ability to be spoon-fed such garbage as to be utterly depressing.