"I mean, someday, JRB will have a hit."
I think that seems pretty unlikely at this point. He's 45, and hasn't had a commercial success yet. (Barring any question of "quality," ditto LaChiusa, Carnelia, Wildhorn, Paul Gordon, Amanda Green, Stew/Rodewald, Bucchino, Blaemire, Bowen, Santoriello, Friedman, and, barring one minor [possible?] success each, Yazbek and Lippa).
Commercial success in musical theatre is increasingly exceedingly rare.