Any hobbyist can -and often does- build a drone out of a kit with a carbon fiber cross, a few brushless motors and some electronics. In fact, a visit to any photo show will demonstrate that the heavyduty photo drones for pro video cameras are basically custom constructions by smaller firms. These things cannot be legislated out of existence, anymore than the first kit-built cars would be suppressed back in the era of the horse carriage.
Pilots of small planes learnt to share the sky with huge airliners; now huge airliners and GA will need to learn to share the skies in some way with the smalller drones that are going to be used for cargo and surveying tasks in cities and over fields. Farmers who use drones to survey hundreds of square miles of crops in the US midwest, or livestock in South America, have a right to use tools to get their jobs done, just as much as a pilot setting down at Heathrow has a right to land without a laser in his eyes or an idiot with a toy in his path.
The sky hasn't fallen - a new technology has appeared, and sclerotic bureaucrats need a kick in the butt so they start to establish a new set of rules.
Edmund