I think LaChiusa's GIANT has a really, really stunningly beautiful score, and although I never saw its premiere, it seems like a really admirable show that deserves a second chance. I don't know how that would come about.
In that same category of I-love-the-score-but-don't-know-if-the-show-works is WOMEN ON THE VERGE. Many Yazbek titles seem revivable to me... FULL MONTY?
I'm still waiting for that Encores! CITY OF ANGELS that's been puttering here and there... and a really top-notch NIGHT MUSIC or FOLLIES, as previously mentioned.
And what about THE SCOTTSBORO BOYS? I think that could be a sensational, timely hit if given the right cast and director.
"I feel safe with you, and complete with you / I'm always finding money in the street with you."
-Sheldon Harnick