I don't disagree with you. It's one reason I loved X-men as a kid. They had girls, and more than one! I didn't mind playing with male toys, but I really liked seeing female heroes too.
I was not at all the stereotypical girl while my sister completely was. She was all about Barbies and other dolls while I loved my Tonka dump truck. I've done what I can to support the idea that boys and girls should both be free to like what they choose with my kids, They have turned out to have pretty stereotypical likes and dislikes anyway, though my girl has been told she "plays like a boy" by boys who were impressed by it.
It's hard to deny that Disney does have a character gap for boys past preschool age. A few will be happy with princesses but many aren't. Disney made the choice to market to young girls and effectively ignore boys in this range in the parks (though of course Disney merchandise still has plenty for them).
