Everyone is unhappy, married people on average are happier than unmarried, religious people are on average happier than unreligious people.
The sexual and feminist revolution got some 'splainin to do.
Of course, my view, the answer isn't "liberating women from the bonds of motherhood and family" but empowering women and supporting them in arguably the most powerful and most important thing one human can actually do in this world: bring new life into it.
A being doesn't want to reproduce in itself, it wants to fulfill needs that compel it to reproduce. A desire for sex, for companionship, for a social role, etc. It's possible to be highly attracted to someone who is infertile because we chase the signs of procreation rather than its actual occurrence. We can rationally plan to make procreation happen but even in this case it is an illusion, we are still chasing some state of mind that leads to procreation.
On the contrary, I am trying to dispel the romanticism here and the hidden additional romantic layer that anthropomorphizes the process of evolution itself by giving it some sort of direction.
There are many reasons I don't want children, but this one in particular has stood out in my mind most of my adult life as the perfect reason not to.
I don't have a definite answer to your question but looking at most of what has happened in history I do wonder if developing opposable thumbs and a frontal cortex was worth it.
Also bus isn't getting full. The issue is two fold: chain smokers in first rows and overcrowding in back rows.
Feminism isnt the search for happiness, its for equity.