I'm actually quite serious. If one thinks about it logically, we can see there is a potential (keyword potential, not absolute guarantee) there will be an increase of jobs.
Currently:
We have sorters, drivers, and mechanics maintaining a fleet of vans and trucks to deliver merchandise. One driver, and during Christmas, usually an assistant mans a truck filled with several hundred packages. The driver and assistant drives around town delivering packages. After the truck is emptied, it picks up packages on a set route and returns to base. The mechanic then repairs, reviews the vehicle and fixes trucks as need be.
Possible Future:
Assumption: the current series of drones will only be tasked with carrying only one customer's packages. The assumption is based on package integrity and ensuring one customer does not intentionally take another customer's package.
Based on the above assumption, to deliver the same amount of packages, there needs to be an increase of drones to fly around and deliver. Because of the increase of drones, there is an increase number of pilots flying the drones and an increase of mechanics maintaining the drones. Lastly, because of the sheer number of drones, a missing drone could potentially be thousands of dollars lost. There will be recovery teams out there sent out to find these drones and return them.