Call_me_jorge said: "Does singin in the rain” even need a star?"
The stage adaptation is...soggy. It never quite works in the productions I've seen (though I've only seen clips of the Théâtre du Châtelet version that Weinstein was transferring). I think the magic of the film is in the three stars' performances, Kelly & Donen's choreography, and the cinematic "meta" elements, all of which are lost onstage. To say nothing of the songs, which are decorative but don't really drive the plot.
I adore the film, but I'd love to see a fully reimagined/revised Singin' for the stage. Maybe by Ivo Van Hove, and instead of rain, it's blood!