Disney never had a shot at Wicked.
The stage show was originally developed and produced by Marc Platt and Universal Studios. It was going to be a film first before they decided to do it on stage. But Universal owns the rights to the musical version and always has.
As for Oz the Great and Powerful, it was Disney's shot at beating Universal to the screen with their own prequel to the story.
Disney actually used to own the rights to the Baum Oz books before they all passed into public domain. They sat on them for so long the copyrights eventually expired. So it's a "better late than never" scenario.
And while it's easy to see how they have tried to trump Wicked, it isn't "sour grapes" over losing the film rights to the musical. They were never up for grabs.
"Jaws is the Citizen Kane of movies."
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