There's no need for mail carriers anymore. All mail should be digitized and scanned to someone's email address (@postoffice.com). For packages, convert existing Post Offices for pickups.
And then what? How are the elderly and those not in a city going to “ pick up” their packages? I love freepers complaining about the USPS while never themselves carrying mail in -20 degree weather or 95 degree heat and humidity all the while having every second of your day montitored by an electronic scanner that tracks your every move. Supervisor doesn’t even have to leave the office, just watch you on a computer screen all day. Can even tell you how fast you are driving. Nobody is getting paid double time on Sunday delivering amazon. The peons that are new hires making $15 an hour get to do that. And most of them quit or get fired before their 90 days are up. Go apply, they’re always hiring for that easy gubmint job.