To the people talking about Manhunt: I'd like to second the comment about Halo and also provide Bioshock as an example. I mean, sure, Manhunt's all about snuff films, but Bioshock has you brutally killing little girls. Granted, they're demonic little girls, but the point still stands. Either way, yes, you can get a heck of a lot more gruesome than Halo.
Anyway, I'd also like to second everyone who says that Pokemon died out. It didn't die out. All the fans just flocked to boards like these, rather than populate the Internet with zillions of smaller websites like they used to back in the late 90's/early millennium. I mean, to be honest, all the people who used to hate Pokemon are now saying "Pokemon. Eh. 'S okay." And sure, the older crowds are growing up, but the younger crowds are coming in all the time. I'm still seeing a lot of people saying, "DP/RSE is my first game." And, of course, if Pokemon was dying out, we'd be seeing a lot less people on these boards.
But if it ever dies out, it's probably just the fans growing up and moving on, with no new fans coming in (which isn't really happening all that much, but still). And given the fact that Pokemon is an old franchise, the youth attention might just be drawn in by something newer and shinier.