Considering the somewhat recent vampire musical based on the Lestat mythology (and wasn't there a Dracula musical within the last decade? -- I don't recall), a DS Broadway musical comedy would die a FAST death. Only a DS musical stage show that enhances the drama and romance (ala Phantom of the Opera and Jekyll and Hyde will have any success...and only if written by Broadway pros (of which I am not one, even though I once thought I knew how to approach this concept....LOL.)
Brian