"Disney, however, wants a completely different portrayal for the American production- a much warmer and sunnier portrayal than the one in the London production."
Uh...isn't Mary a much darker character in the book? And plus, I wouldn't exactly call Julie Andrews' Mary warm and sunny...she was stern and smart and that's what was so great about her. If Disney wants Mary to be a pushover, it would ruin the dynamic of the story, IMO.
"Art is always in crisis: you must work fast to write in the breath on the window."
-Edward Bond