It is still a norm for some areas... Not so prevalent in cities, but rural areas come to mind. I had an ex where her whole aspiration was to raise the children from home, no pursuit of career or anything.... - my family where my mother wore the blue jeans is pretty atypical.

I also think its more than pay gap as well... Such as chosen career, etc. I know for a fact women are underepresented in some lucrative careers like engineering. Nursing for example has $0.10 pay gap, and also I think New York has the lowest pay gap of all the states.

I think the social trend that study suggests won't change until women start taking on more male populated fields.

^^ that being said, women who are primary breadwinners are out there. You never know who you'll find now days.