The biggest issue, even outside of the inherent padding issues (the stage show is 2:45, both movies will somehow be 2:20 each, which...ew), is that Act II of Wicked doesn't really have any real hook. All the songs people know and recognize from Wicked are almost entirely in the first act, and the show isn't as big as it used to be where people would flock towards Part II solely on the name itself. Unless Part I is really, really good and/or Part II features an absolute banger tie-in song from Ariana Grande (which isn't impossible, since Ariana is a hit-making goddess who can do no wrong), we're probably in for a huge decline from film to film.