I don't understand why Johansson is consistently rumored for theatrical roles like Maria in "The Sound of Music" and Nellie in "South Pacific" that require a strong upper register. While she has quite a nice voice, it's very low and sultry. I can't see her singing this score (nor can I see her natural coldness working for such a charismatic character.)
Witherspoon, however, is a brilliant idea. She has a clear, crisp soprano and could do wonders with the role (if she'd do it.)
O'Hara would be uniformly excellent, but I'm getting a bit bored with her as of late.
Tonya Pinkins: Then we had a "Lot's Wife" last June that was my personal favorite. I'm still trying to get them to let me sing it at some performance where we get to sing an excerpt that's gone.
Tony Kushner: You can sing it at my funeral.