I'm not saying it will solve all of them. I'm just saying if you were to pick one thing, the evidence suggests that this could be more transformative than would something like mandatory voting, or something like lowering the voting age. Those may be good ideas on their own, and I haven't done much research into them, but I've looked at some of the statistics you may be referring to and my sense is that the ones that don't have as clear an effect generally involve fewer countries and smaller time frames or countries with more differences in social context. If you look at Turkey, there are very few women representatives in parliament, but there's a social context there that's not seen in Canada or in western European countries, where the situation is probably socially more similar.
On October 4th, 2016. See this statement in context.