Like many people, I love the score, and I think the show as a whole is very powerful. I was lucky enough to attend the concert from 2015, and it was an incredible experience.
That said, I've now see the show live 3 times, and at this point I find the show to be such an unrelenting downer. I usually hate when people criticize theatre for being too "depressing," because it's often a sign of a shallow theatregoer. Believe me, I love when theatre delves deep into hard-hitting emotions. But Parade goes to an extreme that can be genuinely painful and cringe-y to watch, at least upon multiple viewings.
That said, I think the show deserves a new life, and if a non-profit like Roundabout is willing to take it on, I think that would be ideal.
I'm a big Daniel Radcliffe fan (I certainly like him more than I like Ben Platt), but I don't think he has the vocal chops for Leo.