Sure. But then all sorts of things will be banned: footballs, baseballs, kites, model rockets, frisbees, conventional model aircraft, weather balloons, etc etc.

Sure. But then all sorts of things will be banned: footballs, baseballs, kites, model rockets, frisbees, conventional model aircraft, weather balloons, etc etc. The better way to do it is with common sense safety standards, certifications and clear rules on airspace.