About time. I actually heard this would be a good idea in the 1980s from a friend who was an officer in the postal union. He also told me that 3 day weekends were a mixed blessing because they would get a day off and twice as much mail to deliver the following day. He also said the 6 day delivery made it difficult to schedule a regular carrier. My local delivery is crazy usually starting out with early delivery by 11 AM at the beginning of the week to 7 PM at the end. I also ordered a used book out of Amazon which has taken over a week to get here from a city only 500 miles a way. Another book which came from Goodwill in San Francisco took a week too. And tracking on these is awful.
The real problem with the USPS was that a criminal organization known as the GOP got legislation passed that the USPS must fund pensions of staff not even born yet! That legislation should be rescinded. We know the real purpose was a scheme to kill the USPS. Otherwise even with reduce letters due to email and electronic transactions they are making money on package delivery due to Internet sales.