Stunt is the only area of CL that is healthy and growing. The major reason is the wide-spread use of the PAMPA skill classes. This does several things: it allows the serious newcomer to experience success and develop a supportive group of peers. It provides mileposts for progress. Moving from Beginner to Intermediate, etc. gives one a certain sense of accomplishment and pride. The flyer whose main interest is another area, such as speed or racing, can fly stunt as a relaxed, "on the side" event, and stay in a skill class forever if they wish.
Old Time Stunt and Classic Stunt also have been helpful in keeping stunt alive.
Stunt can be flown alone, though this is not the best way to go about it. The other events, except Scale, require a team effort and/or specialized arenas. You can't practice combat, or race alone. For Carrier, you need a carrier deck, and for speed you need someone to set the needle and someone to fly the airplane and a pylon to fly it out of.
The furthur problem in racing is that racers want to go fast, and will figure out how to do so under just about any set of rules. And the ways they figure out are expensive and exclusionary. Look at what has happened in reed-valve Mouse, for example. Now that I think about it, the same is, of course, true of speed and combat as well.
On the other hand, you can take a Twister and a Fox 35, and have a lot of fun competing whilst becoming a more capable flyer.
I wish the other CL areas well, and hope that they will figure out how to survive. Speed-limit combat may work. Quickie Rat may work. On the other hand specialty engines are already available for Quickie Rat.
As far as being competitive in FAI events, read Dave Brown's column in the latest Model Aviation. What would be wrong with flying Expert stunt under FAI rules at some of the major contests? Give our guys a little more practice.