Your first paragraph addresses the miserable state of FPS gaming, your second covers all others.
While I'm totally with you that FPS has gone nowhere beyond Dumbeddownsville the last few years, I'm not so sure all the other genres were necessarily all that bad a few years ago, or all that much better nowadays.
MMOS? While the WoW-ification of that type of gaming hasn't been great, its spawned so many free-to-play imitators and niche games that that I believe MMOS have had no dips, only steady improvements. Heck, Vanguard (old school MMO where you get screwed if you die and stuff like that) is finally going FTP this summer.
RPGs have always had their ups and downs; Morrowind/Oblivion/Skryim, for example, an uneven trilogy that even with a down is still darn good.
RTS? A genre that started so high, it had no place to go. I mean, top StarCraft players were making 400 clicks a minute, there's just no way to make the genre more intense or fast, and better graphics are meaningless when the game's a blur. On the other hand, they've been trying (and failing, mostly) to hybridize RTS with RPG quite a bit, and I don't have a problem with so many attempts to get it right in different ways.
Strategy? A niche market anymore, "kids these days" and all. This was what computer games are all about 30 years ago, but such games are still being cranked out, and the awesome level has never been better with no 'low period', really. Panzer Corps, Crusader Kings, whatever the latest Grigsby game is....great stuff of you like that sort of thing.
But back to FPS? Damn, that's amazing how bad that is. No innovations beyond some RPG ideas, game play that just seems to get more restrictive. Dubious weapon balance. And graphics so intense that modders can't hardly make new maps, forcing the games to go stale, fast. I remember Unreal Tournament that could handle almost every style of FPS...the only style it couldn't do was "sneak and shoot", but for that there was CounterStrike and ridiculously fun Soldier of Fortune 2. Nowdays, you're lucky if the damn games even have spawn protection, much less any sort of balance, or, god forbid, a decent "capture the flag" map, even if that style of play is supported.