Or someone starts up a city-wide drone delivery service for brick & mortar retailers. It could also offer a huge safety improvement for herb & powder retailers.
The safety and regulation issues that would need to be overcome kind of ensures that this drone delivery service would only be started by Amazon or some other giant, probably also making it available to others.
But brick & mortar retailers would end up competing with the company who owns the delivery infrastructure... boy this would be candy crush for anti-trust lawyers...