Technical progress does not always equate to higher wages for the worker. It has to be something they learn to set them apart from others. What I was referring to was the increase of workers in the workforce. Women became more educated at that time and entered the workforce in greater numbers. The supply of qualified workers went up. That stagnated the wages.
I remember it a little differently.
As I recall more women entered the workforce in the '70s because a single earner was no longer capable of supporting many American families. No doubt the influx of women into the labor market had the effect you describe regardless of motives.