As you said, the problem is that women are discriminated against in the industry. I don't think attracting more women will necessarily solve that problem. The problem is with the attitude of many of the men. Attracting more women might even make it worse. Men might start resenting them.
Fixing the attitude problem might attract more women--or it might not.
This is a good example of why I think "diversity" initiatives are missing the point. The point isn't to have equal proportions of races/sexes/nationalities/etc., the point is to ensure that they are all treated equally and justly. Many diversity movements do the exact opposite and treat people differently based on their sex or skin color. I think this is unjust and can often make problems worse, not better.
Back to the topic: I love the welcoming attitude, though. The intention is good, if a bit misguided. If more men adopted the same attitude as Dev Bootcamp, "Women, we value your contributions and will treat you as equals," then the problem would be solved.