Yep, that's three games, thank you for proving my point.
Well theres more, but i just remember them off the top of my head. We're stuck with a FPS crazy at the moment because everybodies trying to cash in on MW2's coattails.
Also technically, i wasnt trying to use those games as individuals, because we've still got DA2, and ME3 coming. As well as other games coming soon like Alpha Protocol, Dues Ex 3. And theres still others like Final Fantasy being churned out, a new pokemon game every year or so. Plenty of MMORPGs.
All genres do this, they go in and out of fashion. But most genres these days will still be around for a long time. Except for point and click adventures