To answer your question, I've been playing war games for 40 years (an indication of my age) and Combat Mission for about five years. CMBO was not heavily marketed, and I only found out about it by accident.
I have very limited time for gaming, which I now mostly spend on CMBB and CMAK (OK, and Civ 4, but that's another story). I don't really want to spend my gaming time or gaming dollars on assymtrical warfare, and "real time" holds no interest for me. I'm not against hypothetical scenarios. I used to play a lot of NATO versus Warsaw Pact, which was not assymetrical when done right, but Syria doesn't grab me.