Suppose the scale rules were to be amended to remove the requirement that man-carrying aircraft are the only allowed subjects for modeling. There are some interesting RPV/Drone aircraft out there now that would make good scale models. Predator, Reaper and Global Hawk come to mind.
Rules could be something like this:
Full scale subject aircraft to have a minimum of 20 ft wing span and model scale to be a maximum of 2:1, ie, half size of the original would be the largest scale model. The intent is to exclude the small drones that are model airplanes to start with.
Prototypes must be actual flying aircraft (same as existing rules)
Weights, etc., to conform to existing rules.
Aircraft must takeoff and land on its own landing gear, no dollies, rail or hand launched allowed.
Drone models allowed in all classes.
Interestingly, there have been many full scale man-carrying aircraft operated as drones. I personally am aware of B-17s (operated at the Bikini Atoll nuclear bomb tests), Hellcats, and most of the modern fighter jets. Kinda of a grey area here, since most all of these retained the cockpit and manual flight controls, just had no pilot when operating. Some used human pilots when being ferried, then R/C for missions.
Regards,
John W