Bob nailed it again. Some of us fly turbine models and full scale. The proliferation of quad-copters is going to grow as a problem. Many of these people are not model aviators. They don't give two-hoots about airspace issues, model airplanes, etc.
In full scale helo flying quad-copters are a real potential threat. However, no one wants to see them banned yet. Idiot operators combined with large powerful government may take it out of AMA's hands eventually.
In Model aviation we bring it on ourselves sometimes. In jets we meet at airports. It's surprising that hasn't resulted in more problems. We love the large runways. Ever wonder though,how full scale pilots may feel if they can't get in and out of their airport and their hangars are blocked by RVs and people? If we haven't wondered about that, then that's part of the problem.