July Andrews? ...like Julie Andrews?
Assuming that's who you're talking about, I don't think people will cast Julie Andrews in evil roles... And can she sing it? I thought she only had like a four note range now. Not that the part has a huge range.
Samantha Barks could 100% play Elphie and might be considered big enough, just coming out of Les Mis. She has a good American accent, too, and used to play an American on some weird Disney Channel show.
As much as I love Kristin (as Glinda, I mean), I don't foresee anyone thinking she looks young enough. Megan Hilty does though, and has the power because she's on Smash. I hope they at least
consider her.
Robin Williams or Steve Martin would be perfect as the Wizard. CZJ with some age makeup could be good as Morrible, I think, or if they want to go down that road they could put Patti or Bernadette in it.
Darren Criss would actually be quite the Fiyero, even though I'm not a big fan.
"Nice is different than good."