"Now any fool can walk into any high-street store and for a few pounds can purchase a large flying machine that they can fly from their back garden, with no skill required. Their thought processes don't venture beyond their own selves to consider the danger that their actions may present to others."
You are describing a bird brain .But i don't think airtraffic is ever diverted because of one bird 2 miles away . Why drones are special ?
I think there is much more "drone phobia" than real danger
Whatever , chances are before something silly would happen there will be sufficient arrests and legislation to make flying the hooby grade ones indesirable.
With the proffesional ones there is another thing , robotic aircrafts are desirable and sometime in the future , as their number increases same things that happens to the manned ones will happen to them (mid air collisions)