Why not women Expendables?

Just asking, there are a lot of action actresses, like Jolie (Tomb Rider), Biel (Blade), Beckinsale (Undeworld), Alba (Dark Angel), Garner (Daredevil), Jovovich (Resident Evil) etc.

They should make Expendables 3 with those as villains :) or at least a movie with them all together :)