Henry Cavill, Heath Ledger, Hugh Jackman, Tobey Maguire, Tom Hardy, Chris Hemsworth, etc were all considered low-key to the general audience before landing their respectful roles.
My point is just because Carano is a name that the public will identify with (assuming the film makes her a star) doesn't mean she's a great choice for the role.
I personally want to see a Wonder Woman and Justice League film in the near future but miscasting a massive role such as this one destroys all that hard work (Exhibit A - Ryan Reynolds as the Green Lantern and Martin Campbell as the director for a film of this genre -- green screen and CGI). I'm sorry, but it's like suggesting Megan Fox for the role or Angelina Jolie for Catwoman.