I think that worked in the timeframe it did because women as a group aren't generationally poor (which is to say they aren't born any more or less well off than men), and so the entire shift was one of cultural attitudes. Perhaps AA for women helped normalize female doctors more quickly (haven't looked at any data on this but it seems plausible), though it remains to be seen if the same strategy can work for balancing CS. I'm curious though: did people at the time assume female doctors were less qualified because of AA?