Driver would be a better fit as the Witch in a stage revival. Unfortunately, for some inexplicable reason, her career has largely stalled, no way they'd hire her to headline a film this huge, especially after PHANTOM was such a huge mess of a movie on just about every level.
If they do get Witherspoon, I hope she steps up her game, there was a time she was great in all her films but after she won the Oscar she hasn't given a single memorable acting turn. The debacle THIS MEANS WAR left me with no desire to see one of her films in a long time, a LEGALLY BLONDE/ELECTION Witherspoon would be fantastic in this, but she hasn't been that good in a very very long time.
I like the Kristen Wiig idea, but I don't think she'll be approached in a million years. That's not really true. Marshall was considering Wiig for the lead in the THIN MAN re-make that was shelved in favor of fast-tracking INTO THE WOODS, I'm sure she was seen for this role as well. Her or Melissa McCarthy would be my top choices. Though of course I'd never say no to Toni Collette being cast in anything, something tells me she'll once again get passed over in favor of bigger names though, especially now that she's gonna try to go back to TV.
"Some people can thrive and bloom living life in a living room, that's perfect for some people of one hundred and five. But I at least gotta try, when I think of all the sights that I gotta see, all the places I gotta play, all the things that I gotta be at"