re "hip hop," there is quite a bit of very legit hip hop in the show, not "Broadway-sounding 'hip hop'" or "hip-hop-ish." There are, however, a lot of non-hip hop songs in the show as well. I suspect the quotes that are referenced have more to do with the poster's subtle sneer at it.
re recoupment, the show has a moderate capitalization and a moderate nut. I would expect it will recoup fairly briskly, but yes it cannot actually recoup until it has banked the revenue. (Investors are not going to be paid back in accts receivable.)
I think the show will be historical in the Broadway (A Chorus Line) sense. I have no doubt about its longevity especially because, unlike BOM, it will be a magnet for school groups long after its must-see status has run ts course.