Well you are missing the biggest RTS game, StarCraft II. Now I'm not much of a SC guy myself.
Actually, I still play an RTS game from 1997. Total Annihilation. TA is probably the "Best" RTS game ever made. There are still a few sites making 3rd party addons to the original game.
But, unfortunately yes, they are a dying breed of games. Most gaming has gone the way of the FPS, but thats because all the studios & devs can make alot of money on them. Most of the devs don't care about games as much as "How" much they can make? Activison, EA, Valve...are all culprits in this. I personally miss the late 90's-07' games. I really love plat-formers & adventure games, but they just don't make those anymore. I mean I love Jak & dakster, Ratchet & clank, God of War, ect. Its just the way games go. Eventually they will get over-saturated with FPS games and people will stop buying, then devs will start making them.
This exact reason is why I haven't bought a new game for my 360 since Mass Effect 2/Halo Reach. Just the times my friend...gaming was at its height 5-10yrs ago. I personally think its in a terrible rut right now. I'm only looking forward to 2 games this year....Mass Effect 3 & Halo 4. It sucks to be a gamer right now. Especially if you like RTS games.(ME)