Amazon has already started their own delivery service. I've said from the start that it would eventually be the company's downfall. They have to keep looking for opportunities to cut costs in order to keep their prices low, and their own contract drivers are a big reason why delivery service has declined considerably in many areas.
We have those Amazon delivery vans around here, too. My point was Amazon’s competitors need the PO a lot more than they do. Changes to the PO will hurt Amazon’s competitors more than it will hit Amazon’s bottom line.