This final sentence is false. Two wrongs do not make a right. The better option would be to change the promotion process to focus as much as possible on the qualifications. NOT Quotas, and no quotas don't directly relate to intelligence, however there is no doubt that it provides an unfair advantage to the underdog and plenty of people are actually hurt by this because they are being accepted into things that they are not qualified for.
I question the final percentage in regards to happiness. Please provide the link for me, I would like to look into that.
That still doesn't cover all the reasons that play into who becomes CEO and even how far women get into a specific field. A blanket cover of office politics is the reason doesn't cover it, and only plays into a small reason into the question.