"In the Heights" is not a good example of "getting it done" quickly--that film was in development since its original broadway run a decade ago, and it was set to go into production with Kenny Ortega before funding fell through. It was then, of course, reignited by the popularity of Hamilton, but even so, the film won't be out until 6 years have passed since Hamilton's broadway opening. In the Heights went through a long production hell, like so many movies do. Also, Rent went through another long development phase with multiple high-profile directors attached at different times. It is not at all unusual for movies to spend long periods of time in development. Chicago was also in development for decades before it finally came to fruition. Take a look at the wikipedia page for the Evita film, which began development even before the score first hit the stage and nearly always had an A-list star and director attached for the next twenty years.
I'm not waiting with bated breath for this film like I was back in 2009, but if the artists and Universal weren't truly committed to this project, I think they would have given up by now. Universal produced the Broadway production specifically with an eye to later adapting it to a film in the first place. It may be two years from now, or it may be fifteen years from now, but Wicked has been such a sustainably popular property that I am sure the film will come to fruition in time.