Let me offer some insight on how things work out by 2030. Postal mail will decrease by half of what you get today. Coupons? Most will come to you via email. I would predict that we will discuss opening the post office for delivery for three days a week by 2030.
Old news. Even last year there was serious discussion of alternating three day deliveries by neighborhood. Some people would get M-W-F delivery while others would get Tu-Th-S delivery.
Is there a single piece of first class mail that wouldn't be just as good the next day? If I need something delivered tomorrow, or even today, it goes electronically or by some express delivery, not first class. OK, you might get a birthday card a day late, but I get enough of those anyway with procrastinating relatives.
Yep. Cut the delivery people by 50%, and have half the delivery area get mail Mon, Wed, Fri and the other half Tues, Thurs, Sat.