I would honestly be surprised if this was the case, at least for the end customer.

At best we'll see immediate drone delivery as an incremental surcharge or a value-add for a subscription service (Prime).

drones can only get cheaper over time.

employees need to eat in 2015, and 2016 and 2017, etc.

So we get our new gadgets on a few hours for less cost to the company, more dollar-cost to us, and in return we have more unemployed people so pay more taxes.

I'm really not a Luddite; we need to find ways to put the tech development focus on things that benefit society as a whole.

/rant

The cost savings will get passed on to the consumer; retail is a very competitive low-margin industry.

We get our gadgets for less cost and the people that used to deliver them get paid by the government to retrain to do something else that's actually fulfilling and productive.

Win-win.