I think it's a good idea from a visitor safety point of view if nothing else. I use to fly R/C airplanes and it doesn't take long for a mistake to compound itself into a runaway plane.
When you've got a R/C plane with up to a 6 hp motor spinning a 24" thick hard plastic propeller at 10-12K RPM, it can be a recipe for disaster. I think that since "drones" have become more abundant within the last couple of years, then they needed to firm up the rules to address this new type of vehicle.
I don't want my family or I to have to worry about the skill level of a R/C vehicle operator flying a object above my head.