The Post Office (USPS) is considering dropping Saturday mail delivery. They’ll eventually do it.
I have a better idea. Keep Saturday in the mix for a while but cut mail delivery to three days a week. Just split every district into two parts, east/west, north/south, whatever. One part gets mail on Monday, Wednesday and Friday; the other on Tuesday, Thursday and Saturday. Nobody will care, not even NetFlix.
Keep all the postal workers but don’t replace them until the work force is cut in half.