Re: Who would you let Joss Whedon kill in Avengers 2?
Out of those three Ms. Marvel is the only one I think there is any chance of us seeing.
Marvel won't do Spider-Woman since Sony owns the rights to Spider-Man and they will want to avoid any confusion among the general audiences.
She-Hulk is just redundant at this point. We've finally got a great representation of Hulk on-screen, and there's just not really a need for her. However, if they ever do another Hulk solo movie, I wouldn't object to the introduction of Jennifer Walters.
Ms. Marvel, however, could be a strong addition to the cast of characters for the third Avengers though.