I could be wrong but the picture I'm getting in my corner of the world is that ARF fliers don't stay much in the hobby, RC or CL, yet those who really "catch the model flying bug" very quickly look for kits and plans. Seems the ARF crowd goes through them quickly, soon finds it boring, sees everyone else flying the same thing, and moves on to other things.
Some friends I taught to fly on ARFs are now scratchbuilding scale models, after having built 2-3 kits.
Myself, I always have one ARF for "fun and practice", no problem with that, but always one. Recently got tired of the big P-51, so swapped it for an unassembled ARF P-40.
The rest of my models are either scratchbuilt, or from kits (Sig "real wood kits").
I'm not worried, I think ARFs offer a good introduction, and then a good filter to sort out the real modelers from the "just fliers".
I read a lot about people anticipating that kits will dissappear but don't believe it, just look how many laser cutters there are for those wanting their own kit to build, and you'll see what I mean.