Honestly, to erode these stereotypes? All we have to do is not be them, and slowly they will vanish. Veering in the absolute opposite direction will just be overcompensating, and reinforce them.

Is it just the costume, as well? What if Power Girl got a new costume, a well designed one that doesn’t look like swim wear, but remained exactly the same otherwise. Would that be alright?

because of this comic, women can’t vote anymore.

When a piece of work that is purchased and taken in by thousands, perpetuates an incorrect mindset, regardless of how minimal that contribution may be, it is ultimately destructive. Anyone who writes superhero comix has to understand the context, why the status quo is as such, and what about the status quo is incorrect. Any girl or nonwhite kid will tell you that other than some brilliantly conceived iconic superheroes, they really don’t look towards marvel and dc’s pages for their heroes, because we aren’t catered too.
The industry has often reacted by patronizing; creating lifeless run-of-the-mill characters and then getting surprised why no one buys it. When the women who are supposed to be role models are absolutely impractically dressed, looking like Halloween’s worst, it positions the man in power (the woman as unworthy of standing alongside if not above him because he isn’t dressed to fight crime but to look good). It perpetuates the pornographic voyeur eye for guys, and furthers the gap of understanding between both sexes. There’s a reason why the stereotype of the creepy comic book geek exists. Worst is when a comic like the one Esther pointed out tries to justify what is incorrect.
You don’t think such things as bad movies with gratuituous violence play their role, regardless of how small, in the general indifference one has towards their fellow man’s suffering? So sure this comic didn’t move the seas. Neither does a crappy song or stupid television show. But every little piece does its part to maintain problems as opposed to fixing them. Maybe you should’ve measured your response.