There are so many things about the musical that wouldn't work on film and the most killer moment in the show -- "Defying Gravity" -- would be one of them. It would be complete CHEESE on film. As much as I LOVE the show, I think the book is at LEAST 10 times better. It's more of a story and it's a BETTER story with an ending that actually makes sense.
I would be the most excited person in the world if they made a Wicked movie based on the novel.
All that I ask for:
Hilary Swank as Elphaba. The novel-role requires some serious acting chops, and Hilary has that (she didn't get two Oscars for nothin'), plus she's tall and can look both innocent and fierce.
Keira Knightley as Nessa. Despite her teeny-bopper (I know you hate that word, but I want to use it) associations, she really is a good actress and she has the perfect look for Nessa and could pull of the level of insanity rather well.
I would love to see an unknown, NON-CAUCASION as Fiyero. The coolest thing about a movie is that the tattoos could work.
and
Judi Dench as Morrible. Because she kicks ass and ANYTHING and this type of role especially.
As long as the rest actally fit the character decriptions, I'm good. :P