Isn't part of the problem that statistics are not reliable? In 'the good old days' there would be people who appeared to be in a 'traditional' family, but weren't necessarily.
I know it's a fictional example, but Hardy's Jude the Obscure is about a family where the 'husband and wife' never married. Obviously, therefore, such situations existed.
Also, lots of people lived in 'empty' marriages, but wouldn't divorce. So, the stats. show the legal situation, but not necessarily the 'real' situation.
My mum definitely believes that a woman's job is to support her husband. My dad isn't a horrible person, but if he & I disagree, she will take his side. Imagine that situation with a bit of an arse for the guy - the marriage would survive, but the people would not be happy. Perhaps feminism hasn't emasculated men, but just stopped enabling crappy behaviour from them.