In a certain sense, though, you could argue that eventually it was always going to happen, due to technological efficiency and ease of life generally with increasing standards of living.The stark difference between early 20th century men and the later ones in the 1990's is sadly clear. I also think the lack of technology watching and broadcasting the demographics and culture changes played a role in women's suffrage. For example, before social media, men used to speculate whether a women could or couldn't handle important decisions and usually gave them the benefit of the doubt, now we can see them make poor decisions online with timestamps and ease of reference.
The real question is what causes restriction of women to come back, or what can a culture do to get that balance reasonable. We're WAY beyond anything healthy for women, children, family formation, or fertility - at least for european peoples.