It seems a bit ridiculous, but if not this specific business (delivery of text books by drone) I could see this type of delivery method become very useful for all sorts of materials, legal and otherwise.
I know the sensors are fairly good, but you would soon have to organize some sort of traffic lane type system if the drones were popular, would you not? (thousands or millions, not hundreds)
Jokes aside, in Greece we have a HUGE market for Gyros (the Greek burger counterparts) delivery. But as of now, a guy comes to your door, so we can be in pajamas, working on your laptop, etc. I don't know how this drone could safely land in those narrow streets, but if it could oh boy, it would be disruptive.
