I know what you guys mean. I love RTS games, but we have been in an RTS drought for the last few years. There used to be a lot of great RTS games released every year. Now, we only get a few good, moderately high budget RTS titles per year. Even then, RTS games are getting more simplistic. EndWar, while fun with a unique concept, is about as bare bones and simplistic as RTS games get.
I think it is just that too many gamers these days don't like to think while they play. RTS games don't sell nearly as well as they used to, while shallow action titles can push many, many copies. So, RTS games aren't as commercially viable as, say, Generic Shooter Dude 25. Therefore, developers shy away from the genre more and more. While RTS gaming isn't dead yet, I wouldn't be surprised if it gets there within the next few years. High profile RTS games, hell, even low profile ones, are getting fewer and further between. The fact that most developers are turning towards console gaming over PC gaming doesn't help; RTS games are generally pretty weak on consoles.
Actually, really good Western RPGs are getting less common too, but that is a debate for another time.