You could tie in some other things, show the great 'community' of RC aeromodelers, the different facets of the sport/hobby, LOTS of Jets and 3D of course , styled scale and warbirds. Dip into the history of model aviation, into the AMA, their facilities/events (sure the brass would love the chance to show off all our great new investments ) Long story short, contrary to nay-sayers, there IS a way this could work. You just have to imagine!!
Not nay-saying, stating fact...
You still need something that reaches out and grabs the watcher by the shirt and makes them say, "WOW," to tie all that stuff together. With the rocket shows, all the background filler was interspersed with spectacular launch attempts. There's no "will it work? Won't it work? How big of a fireball will it make?" suspense hook in model aviation.
There's a lot of suspense value in the test flight of an experimental rocket, which is done regularly at events. If you haven't test-flown a plane, you don't fly it at an event.
All you've got is the background stuff interspersed with airplanes buzzing around in big ovals overhead. Yawnfest. I'd love to see a special on R/C airplanes on Discovery just as much as the next guy, but I just don't think it can be pulled off.