Some of the arguments both for and against Wicked being part of USF is that it’s a “studio park” and Emerald City would either fit perfectly or contrast the theme of a “studio park”. I dunno, but I have the argument that USF should cast aside the studio theme for several reasons, one of them being outside of a small number of attractions like Mummy (which rumors say was originally going to be a haunted museum), USF is totally not really like “studio” anymore. Plus Diagon Alley makes the rest of USF lands embarrassing in comparison.
Like USF could evolve into a different theme entirely, like maybe do something like Halloween Horror Nights did in 2009 where the facade of the front gate is a movie theater, and the story for the whole park is that all the attractions and streets are basically movies inside the theater. That could live up to the “Ride the Movies” tagline and could make Wicked make sense being in USF.