Pixar Studios
Walt Disney Animation Studios
LucasFilm
Muppet Studios
ABC Television
21CF
Don’t think of “studios” in the sense of it being a working studio. Think of all the different “studios” that Disney owns that it can use in its parks and currently does.
That’s a pretty loose fit. I think at this point they’re just holding onto the name because people know it and changing it won’t really do anything except cost a small fortune.