Are you truly asking WOULD have or SHOULD have?
Either way:
"If "Thoroughly Modern Millie" had not won Best Musical, "Mamma Mia!" would have"
BWAHAHAHAHAHAHAHA
"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