At the moment I'd say that the 1950s were going through the process. They are certainly being re-invented and especially by spankos, who see the decade as a sort of domestic discipline nirvana. And why not?
The fashions turn up in shoots and there are any number of stories featuring no-nonsense dads, scarily strict mothers and 18-plus daughters (and sometimes sons) who accept corporal punishment when they do wrong.
And it sort of works for me as a child of the 1970s. Growing up in the 70s corporal punishment was part of our lives, but a rarity (where I lived anyway). But adults were more than happy to tell us about how we had it good and how the tough the rules - and punishments - were when they were kids.
As a spanko-in-the-making it gave me a thrill - it was scary and exciting all at the same time. I'd love to know your favourite decade for spanko fantasy - please vote in the poll over on the right of this page.