User blog comment:BIONICLEToa/Why can't Marvel have a main female role in their films?/@comment-1895174-20140320065414

In addition to what others have said, we're also talking about a medium where a disproportionate number of its heroes are white guys. For every female hero, or black hero, or what have you, there's 10 or so white male heroes. There's less of an opportunity for female heroes to get out there because there's simply less of them.

What really doesn't help is that most of Marvel's most significant female heroes are prominent parts of teams or are supporting characters rather than being a hero just on their own. Sue Storm is with the Fantastic Four, Storm is with the X-Men or Black Panther, She-Hulk is with-well-the Hulk, Wasp is either with the Avengers or Hank Pym, Elektra is with Daredevil, etc. The best options are still Black Widow and Carol Danvers, but could they really make a Carol Danvers movie without Mar-Vell?

Villains would be easier. Amora would be a great villain for a third Thor movie. I really want the villain of the third Cap movie to be Sin, or some version of Madam Hydra.