Until the 1970s, a married woman woman going out to work was often frowned upon, at least in the UK. What you describe above may have been a factor but, from my memory, the stigma mainly related to the man being seen as unable to keep a wife and family by his own means.
It was a very similar timeline here in the US. Like you, I'm old enough to remember those days. A woman in the 60s grew up expecting to get married at a young age - by her early 20s. Women could work, but they were mostly single. The Mary Tyler Moore Show, which premiered in 1970, was considered groundbreaking because it featured a single woman in a career (television news producer). I think that was around the time things started changing. A show following a woman's career now wouldn't raise an eyebrow. Before that, Mary Tyler Moore played a housewife on The **** Van Dyke Show, and her husband gave her an allowance.
How much has the cost of living dictated women (including wives) entering the work force? Or has women entering the workforce helped cause the cost of living to rise? As businesses grew to compete for that extra money? It's like the chicken or the egg. But you're right about the effect - parents aren't raising their kids so closely, and it's to everyone's detriment.