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.
I think there is a kernel of a really good show here, but I agree with everyone that JRB is the wrong horse to ride to Broadway on. I also think the Spidey comparison doesn't really hold up to analysis. That show started with an absurd elephant on its shoulders resulting from worse than bad early producing, inept management throughout and a capitalization that ultimately was at least twice what it should have been.
I disagree that the show needs to be LOUD in the conventional sense. I would imagine the music would work best very dramatic and sweeping, like a film score. What Broadway/Musical Theatre composer might be ideal for that kind of approach?
I don't think any conventional musical theatre composer can do it. And I don't think any other composer of substance is likely to be interested. (Hence, JRB.) Another way of saying it is likely to fail.