High flying claims by Amazon about replacing their truck based delivery systems with drone based delivery are a little far fetched but they do make for interesting viewing. As the number of drones increases around our cities, as the sky becomes filled with variations on the octocopter, air traffic control is going to become a nightmare.
We are currently concerned about the safety issues around moving goods from A to B on land transport. If the goods are all zipping along over our heads the public should, perhaps, start to prepare to protect themselves from flying debris from colliding drones.