American Postal Workers Union president William Burrus complains that "It is deeply troubling that Journal editors advocate ending the Postal Service's exclusive right to sort and deliver mail. The Postal Service must remain a public service if we are to honor our nation's commitment to serve every American community "“ large or small, rich or poor, urban or rural "“ at affordable, uniform rates"
My family has a ranch that is absolutely in the middle of nowhere in Wyoming - it is 30 minutes by dirt road from a town of 2,000. The USPS delivers mail to a box 3 miles away from the ranch, and does it 3 days a week. The USPS will not deliver overnight mail. UPS delivers 6 days a week right to our door, including overnight mail.
The word "uniform" is the key -- what the USPS government protected monopoly buys us is a massive cross-subsidy, where city dwellers subsidize rural communities, Alaska, and Hawaii. Further, because the USPS knows that these subsidized routes are cost black holes, they tend to cut back on service to try to save money. The result is that no one is served well, as is often the case when a large cross-subsidy exists -- cities pay more for their mail, and everyone gets worse service.