First, many of the mail-sorting centers need to be consolidated. The sorting and distribution infrastructure was designed and built during the days of much higher mail volumes, and is running far under capacity now. (These are separate from the retail post offices where you go to buy stamps, etc.)
Second, residential deliveries could be reduced to three days per week, in two shifts. Half of all homes would be served on Monday, Wednesday and Friday, and the other half on Tuesday, Thursday and Saturday. This would cut the number of residential mail carriers in half. The carriers who are still working would work the same number of days, but serve different routes on alternate days.
Business deliveries could still run six days per week, either by assigning certain carriers to daily business-only runs, or by putting each business on two (alternate-day) delivery routes.
Third, postage rates should rise significantly. Our standard letter rate is cheaper than in most other countries, at least the industrialized ones. In next-door Canada, the standard domestic letter rate is CAD 0.59, which is almost exactly the same in USD, and about 1/3 higher than our own letter rate of USD 0.44.
WhoWee said:
perhaps use the same people to sort mail 3 days per week and deliver 2 days per week.
All (or almost all) sorting is now done in large Processing and Distribution Centers (P&DC) that are separate from the local post offices that the carriers are based at. For example, I think the P&DC in Greenville SC serves all of upstate SC except maybe the area just over the state line from Charlotte NC.
From
http://en.wikipedia.org/wiki/United_States_Postal_Service#Sorting_and_delivery_process
At the destination P&DC, mail is once again read by a DBCS [Delivery Bar Code System] which sorts the items into their local destinations, including grouping them by individual mail carrier.
At the carrier route level, 95% of letters arrive pre-sorted;[80] the remaining mail must be sorted by hand.
(emphasis added by me)
So, very little sorting actually occurs at local post offices.