To me, I believe A New Hope COULD work as a musical, or even an opera. But what I'd rather do if I were given the reins was a "play with music" treatment of the first six movies. Small cast of actors, lots of low budget "theatre magic." Don't write anything new, just make cuts and transpositions to the existing texts so the two eras intermesh. It's an epic saga about the rise, fall and redemption of a prophet: treat it like Shakuntala, a work of cultural and religious historical import to a culture and religion that don't exist on this planet.