It doesn't seem to be so much of an issue on the smaller maps (least of all Nuketown; lord knows camping on that one almost universally earns a volley of frag grenades, and a sticky demise) but some of the larger maps almost scream for some kind of limitation. I don't mind playing Jungle with a good group of players who will go toe to toe in a stand up fight, but when you start adding the little tool-bags who go prone in the weeds and just sit there the whole game... Just not fun anymore.
I don't think it has to be a dramatic or complicated change, either. In fact, I would say that the most recent Medal of Honor game had the right idea by not allowing players to go prone in multiplayer. I don't think it's necessary to go that extreme, but if Treyarch limited the amount of time a player could go prone, and then institute a cool down period before the player could go prone again (think the same concept as sprinting, only Jenna Jameson style) it would go a long way toward revving up the pace of some of these slow, camper infested monstrosities.
