Is there any evidence that gender is a primary determinant of "thought diversity"? I'd expect other factors, including age, upbringing, ethnicity, etc. have much more of an impact on diversity. A woman and a man who grew up in the same suburbs, went to the same school, have studied the same, etc. probably have very similar ideas on most topics than two men (or women for that matter) who have completely different upbringing.

If thought diversity is what matters, a much better determinant is probably geographical distribution in upbringing and unique educational paths and unique previous employments (all of which can just as easily be estimated by a resume as gender).