I think the issue is that since Avengers people really want a bigger roster of characters made now. Like after Thor 1 came out, you didn't see petitions for Sif, even though she was great. I think just back then people expected just the top 1 or 2, once in a while 3 characters from a movie to be made. They didn't even make Loki 1, although he was planned.
Look at X-Men, a HUGE franchise....all they have made is Wolverine. No other males or females.
For females they have made: Babydoll - Sucker Punch, Amber - Sucker Punch, Alice from Resident Evil, Sarah Connor, Abigail Whistler, Silken Floss, Silk Spectre, IM2 Black Widow, and Angelica from Pirates, plus a few game females like Ada Wong, Jill Valentine and The Boss. Then there is TDKR Catwoman and Avengers Black Widow with Winter Soldier Black Widow coming soon. And they teased Elizabeth Shaw from Prometheus, but there has been delays. Am I missing any?
TDK Trilogy was one of their biggest franchises, I dont think anyone expected a Rachel Dawes? Or Talia? Although I wish there was
I think there are 5 key females they have missed so far from all the movies they made:
Faora
Peggy Carter
Pepper
Maria Hill
Sif
66 Batman is too new and who knows if they will make any more characters. Pfeiffer Catwoman is a character people talk about a lot, and she would be AMAZING, but they are going to have to make Batman first.
I hope atleast 1 of them gets made at some point, Faora being my #1 probably of any figure and then Elizabeth Shaw. Peggy Carter would be 3rd for me, but not far behind. Can't wait for her TV show!!!