To say that Wicked is one of the most successful shows currently running on Broadway would be the understatement of the year or, more accurately, the decade. As the megamusical approaches its 10th anniversary on the Great White Way (it opened Oct. 30, 2003, with Kristin Chenoweth and Idina Menzel in the lead roles), Wicked remains a box office powerhouse, having earned more than $694 million in its Broadway run. Add to that productions in Chicago and California and two national tours, and Wicked's North American total flies to more than $2 billion. Given the show's massive fan base, a movie adaptation seems like a no-brainer, especially with the film version of Les Misérables hitting theaters on Dec. 25 and Sony's plans to bring Annie to the big screen with Willow Smith in the title role. Universal owns the rights to Wicked, but producer Marc Platt is in no rush to push his bewitching tale to the silver screen. ''It's still a ways away,'' he says. ''But the conversations are now starting, and I would expect in the near future to begin the process of development.'' Does that sound too noncommittal to you? Don't worry. ''There will be a movie,'' Platt promises. It's just a matter of when.