It's interesting that many of today's so-called action heroines are bandied about as good examples of female actresses breaking into this male dominated genre, but this often isn't the case at all IMO. Consider three recent(ish) example that are often mentioned - Tomb Raider, Charlie's Angels & Kill Bill.
Tomb Raider - the 'hero' had to be female, but not because of feminism, lack of choice or the studio wanted to mix it up. She had to be female because the lead character in the video game source material is female, and the reason for this is because the stereotype games player is a young male. What better way to get these guys to buy your game? Centre it around a busty, sexy female. It could be argued that the only 'ism' involved in casting busty, sexy Angelina Jolie as Lara Croft is chauvanism.
Charlie's Angels - again the source material of the movie was a female led 70's TV show. I've never watched the show (or the films), but if female emancipation did play a part it was back in the 70's, not some great gesture of empowerment on the part of the film studio in the 00's.
Kill Bill - it's well known that Uma Thurman is Tarantino's muse. He's always said that he wrote it specifically for her. He never intended to be for a man and then changed his mind, so this also isn't a giant step for womankind. Tarantino simply wante to do a film about a female assasin.
I think the point I'm making is that not every film that has a strong, female lead character should be seen as women 'breaking through' in a male dominated industry. Casting a female as James (Jane) Bond, that would be a bold, brave move. Casting a female body builder in a role originally intended for Arnie, that would be the ultimate breakthrough, however I can't see either of these thngs happening.