I'm disappointed about the state of flight sims also, having been playing them since 1987. There is some hope left still, FreeFalcon 5 seems to be in beta-stage, and it seems to be available & free for everybody since it is done by modding community. It looks pretty interesting, and I can't wait to test all the aircraft they have modelled there.
Though the truth is that the flight simulators are simply not mainstream anymore and require far too much dedication to learn to appeal the casual players. On the other hand, I also find them the most rewarding type of games there are, not to mention there are absolutely brilliant people online. One simulator can be played for years, still providing enough variation to keep things interesting.
Mika