I could believe in the spanking thing happening pretty easily.
(I could believe it pretty easily. It wouldn't happen easily.) A society with a different approach to deterrence/punishment, a different view of the relative cruelty of prison vs. corporal punishment, etc. The others require violations of our concepts of physics, economics. Changing the punishment structure doesn't violate our ideas of human nature/psychology, etc.
A while back, Marvel Comics put out a "2099" group of books. The premise of the "Punisher 2099" series was that the civil tort system had replaced the criminal justice system entirely. A violent Paris Hilton type murders Punisher's entire family, and he goes vigilante.
Although, I guess it compares fairly with a black person becoming President in 1901. A few people with broad knowledge might find it possible but radically unlikely. It's a fair cop, and shame on Janegalt.net.