Musicals with darker endings have succeeded in New York and elsewhere more and more often since '74, have they not? Audiences are more open to accept unconventional endings, especially in smaller, more intimate venues. Floyd Collins, anyone?
I'm sure that with the right direction, the right venue, the right cast, and the right producers, the original script could find an appreciative audience.
And by the way, I do not mean a COMPLETELY un- revised script. I only mean one that preserves the original ending in its entirety.
[title of show] on Broadway. it's time. believe.