Amazon air coming to a town near you (or just london)
Total pipe dream.
Note the house they showcased in the video was like some rural manor. Won't work in inner city areas like high rise flats or terraced streets due to space constraints.
What's more likely to take-off (excuse the pun) is mobile parcel lockers in the form of an electric powered driver-less van, which is something Royal Mail is exploring.
So the only human element will be staff at the local mail centre or delivery office to load/unload the lockers on the van. The computer will plot a route to the drops, customers get given an ETA, van arrives at address, customer inputs a one-time use code which unlocks one of the lockers, customer removes packet and the van goes on its way.
That kind of setup could run 24/7 with very little expenditure, no fuel cost, no driver.