Re: people are still needed to work along the delivery chain.
The orders are taken online and processed by the computer. So no data input employees. The items will be stocked by robots, so no stock boys learning to keep to a schedule before they move onto bigger things. The items will be delivered by drones, so not even any delivery drivers.
The claims about the people need to program/fix these things are largely irrelevant. You needed someone to program when you had the data input employees and someone to fix the trucks for the delivery drivers. The only smallish gain you might get is in mechanics for the robots, but that could be robots too. And in any event you needed supervisors for the stock boys and they're now gone too.