I recently got a phantom 3 drone from DJI and they are very clear on the 400 ft altitude restriction and with the on board GPS will not fly into any restricted areas for drone operation. It will not even take off if it is in unauthorized airspace.
Almost all drone operators are responsible flyers and respect the privacy of their neighbors. No recreational drone to my knowledge has ever hit an aircraft in flight. Model RC aircraft much larger have been flying for decades with no problem. There should not be any concern for these much more sophisticated drones with GPS flying with existing restrictions.