I don't disagree with your conclusions. However, keep in mind what problem we are trying to solve here. The problem being that there is a positive feedback loop in gender participation in the disciplines such as Caltech focuses on, which we would like to fix. This feedback loop stretches horizontally across societal institutions way beyond just Caltech, and vertically across time and generations. Put on your engineering hat and see how you would solve this problem?

The current push is to attack it from many leaf nodes, the Caltech example being one of them. The hope is that if this is done in many places, we will dampen the feedback loop and end up with a more equitable representation.

Whether that problem is the problem we ought to be solving is another debate entirely.