I think it's safe to suppose that game publishers, like most business people, measure success or failure in terms of dollars. They don't care what your reasoning is, or your stance on intellectual property, they care how many of you pay money for their game. So the way to convince them to drop DRM is simple: show them that actual dollars will flow, in equal or greater amounts, to DRM-free games as to DRM-laden games. This is already happening with the Stardock games (mod their recent odd announcement about some sort of in-house DRM thingy called GOO), so that's a useful example people can point to when arguing with the bottom-line types who view games solely as generators of dollars: "Look, those guys didn't use SecuROM, and they sold plenty of copies."
My point is, this line of argument will only work if people actually *do* buy games. If you work yourself into a righteous frenzy and refuse to *ever* buy a game, you're guaranteeing the death of your hobby on the PC. Publishers aren't going to accept a deal where they spend millions of dollars to develop a game, and nobody pays them for it. So vote with your dollars: if you like a particular kind of game, *buy* it. I'm not saying that you should go to jail if you don't, I'm just saying that if this doesn't happen, big-budget games will exist only for consoles. (Indie and open-source projects will continue to exist on the PC, their natural home, but honestly, you're not going to get the same type of games out of that sort of environment: it's currently just too hard for non-professionals to develop big, graphics-intensive games. Some people are fine with that. If you're not, you should really consider voting with your dollars.)