RE: Is modeling becoming too diverse?
Well, I've never built a successful rubber powered model. Rubber power is just too technical and difficult for me. I used to fly with the Thermaleers Free Flight Club and got to watch experts fly . No way I could learn to do that. I've not flown paper airplanes, but I've read some about them in Aeromodeller. Getting a 30 second flight under a 30 ft ceiling throwing a paper airplane is darn good, I think.
I'm pleased I can still fly a fair CL stunt pattern. I am getting older (which beats the alternative). When my reflexes slow down a little more, and I can't concentrate enough to fly the pattern well, I won't quit modeling. I'll learn to fly RC and have a lot of fun with it.
If one wishes to master any aspect of modeling, all offer considerable challenge. It is fine to prefer one or the other, but to denigrate any other form of modelling is unjustified.