On a plus side, I see this of great use in disaster areas where essential meds and water could be droned in by their 100's or even 1,000's, leaving the real helicopters to airlift out casualties.
On a flipside, I see regular mail couriers losing their jobs, or actually re-skilling as virtual drone pilots.
Whatever happens, hopefully, the 'good' potential outways the 'bad' risks.
I expect as a joint development, "drone-slayer" automatic laser cannons will be able to strike rogue drones carrying terrorist payloads destined for government or military targets. So, the battleground evolves.