I'm not a big fan of positive discrimination. I do think however it could mean those who initially never thought they could make a go of it in the industry are encouraged to enter it. It makes aviation less of an old boy's club in terms of "dad did it so I will too", and it brings fresh blood and ideas into the industry. It would be great to see "pilot" as a more popular career choice for young girls, akin to how it is for boys. You only have to look at some of the Virgin ads to see how girls could be influenced by society.
Obviously the anecdotal reports of sub par candidates getting offers is worrying... That will come back to bite airlines on the bum. However, if it means more girls see the prospect of being a pilot as achievable and aspire to go into the industry it would create more competition and possibility raise standards...