Sure. But again, pension reform will go a long way to helping.
The duty to deliver mail is enshrined in the Constitution’s Postal Clause, so it’s not like it’s some overreach of government.
In addition, there is zero incentive for private companies to charge as little for private delivery to rural areas as the USPS does. Eliminating it would harm rural areas.
The USPS is astonishingly efficient when you consider the volume it handles to every home in the U.S.