"Research shows that sales and profits go up when we make girls' toys pink."
"Okay then, make girls' toys pink!"
Anyway, my guess is that whatever strategy would encourage the majority of women to go into programming isn't necessarily something women on hacker news would like, because women on hacker news are part of the self selected minority who already buck gender trends. You don't need pinkification because, if you were the type of person who did, you wouldn't be here.