This euphoria is largely based on assumptions that drones inevitably deliver better customer service at lower costs with a better environmental footprint than conventional delivery by a driver in a parcel van. These claims are little more than flights of fancy that cloud a more realistic assessment of the potential for the use of drones in logistics.
For the technology to work in commercial practice, however, the economics must also work.
Source: Commentary: Drone-Delivery Projects Must Look Beyond the Hype – WSJ
The primary value in drone delivery may be
1. Delivering value dense items that need to be delivered quickly. Medicine is the classic example.
2. Very short hop delivery. The USPS is experimenting with drones that launch from your local postal delivery vehicles to carry small packages up to home door steps, rather than having the postal worker have to take time to walk that distant (and deal with loose dogs!)
3. Delivering items to remote customers, not urban customers. When a delivery truck comes through my neighborhood, they commonly stop and deliver packages to multiple homes. This is pretty efficient. But delivering to remote (e.g. farms, ranches) and rural properties is not as efficient.
The dreams promoted by Google, Amazon and UPS of zillions of drones flying miles out from warehouses to drop off low value packages at consumer homes are not realistic at this time.