There's not much we can say about this that hasn't been said already by those wiser and more articulate than we (e.g. Chimamanda Ngozi Adichie herself), but to put it briefly: we should all be feminists. This isn't about wanting money (although equal pay is important--and let's not gloss over the fact that the disparity is greater for women of color than it is for white women. That's important). It's not about wanting more women in politics, or in science, or nominated for Oscars, or running corporations.
At least, it's not entirely about that.
This is about opportunity. This is about attitude. It's about working together to re-shape society into a place that welcomes and encourages and supports those of us who aren't white men. It's about creating an environment in which a woman who wants to stay at home with their kids and a woman who wants to work full time are both given dignity and respect for their choices: a space where expectations are not defined by gender.
It is, as Adichie says, a reminder that culture does not make people. People make culture. And we must--we can, we should, we must--do better.