It's not fair to conclude that women just pick less lucrative fields; other studies have shown that as women enter a field, they are paid less than male colleagues, even for the same work, therefore dragging down the overall average compensation for the field. http://m.sf.oxfordjournals.org/content/88/2/865.short So no matter what women do, whatever field they choose to enter will become less lucrative, not due to their choice but because of inherent gender bias in pay.

Another factor that is not addressed in this study is the fact that even apart from societal expectations, the inequality of maternity and paternity leave policies don't fairly give moms and dads the chance to be equally involved in childcare from the very beginning even if they wanted to. http://www.ilo.org/wcmsp5/groups/public/---dgreports/---dcom...

I don't see why we should be satisfied with the current situation for men, either. Why wouldn't we want a society that gives moms AND dads the option to be involved and present in their kids' lives without branding them as insufficiently dedicated to their work? I think it's totally unfair when I hear about friends who are dads who are met with skepticism when they want leave from work for their kids. There's no shortage of research showing that parental involvement, from both sides, from an early age is good for our kids.