If they put stars in the cast, it could sell out. Sure.
It could also sell out without stars.
(For the record, I recognize that you consider Menzel, Rapp, and LaChanze "stars.")
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle