Here's a third view (Draves) on female engineering students: That the natural proportion of either sex with one or more of the abilities of the other sex is 20% (Michael Gurian). If you want more women engineers, you have to figure out how first.
Doreen Kimura has demonstrated why males have higher spatial skills (needed for engineering). Males get three surges of testosterone early in life, and their spatial skills go up relative to girls right after.
Women's higher communication and language abilities explain why 75% of female engineering graduates drop out of engineering and go into teaching (Chronicle of HIgher Education).
Susan Pinker explains why women value meaning, relationships, people and mission more than men: women get a hormonal 'high' and also live longer. That's why women drop out of high paying law firms begging them to stay with $800,000 salaries, child care, flex time (whatever they want).
This view says that unless academics figure out how to keep women in engineering, that more female graduates means fewer engineers, and a crisis in the work place, where engineering firms are already pleading for more engineers. By artificially increasing the percentage of female engineering students above 20%, colleges will worsen the current shortage of engineers by excluding qualified males, graduating lower performing females, and society pays the price when 75% of women drop out of engineering after college. Find the answer first before you try to change Mother Nature.