False Titters, sorry, you are mistaken. Harvey Fierstein is not a "movie star." Travolta is a magnificent casting choice. While Fierstein has appeared in a few films, his acting abilitites were clearly embarassing.
You may have noticed his name has never been used to promote any film in which he appeared, including the dreadful TORCH SONG TRILOGY film, in which his performance was the weakest link by far. When someone's name is used in conjunction with publicizing a film, that usually means they are a "movie star."
Most people in the world have no idea who Harvey Fierstein is.
Sadly, those who saw Fierstein perform IF I WERE A RICH MAN on LIVE WITH REGIS AND KELLY were simply uncomfortable or embarassed at his dreadful and uninspired performance. The studio audience barely applauded and Regis told Harvey he was "very good." Harvey Fierstein's performance in FIDDLER received negative to mixed notices, at best, from the professional critics.
This does not bode well for one being entrusted to star in a major film musical.
I suspect the "PHANTOM" error of not casting bankable movie stars is a lesson learned. This is why Broadway performers rarely repeat their parts on film. They are terribly different art forms and even legendary greeeeeeeat Broadway performers often cannot and did not create the magic onscreen that they did on stage.
Again, Travolta is an inspired and almost obvious casting choice. This is based on his stardom, background in muscials, two Oscar nominations, his proven box office appeal and the fact that he, Travolta, STARRED IN THE HIGHEST GROSSING MUSICAL IN FILM HISTORY,....GREASE.
"Blow out the candles Robert and make a wish. Want something, want SOMETHING."