Hamilton is an anomaly because its casting is intended as commentary on the events of the era, and not specifically as a way to increase employment opportunities for POC. To me, the best ways to increase opportunities for POC on Broadway are 1) do more shows that feature stories about POC; and 2) acknowledge that "white face" (using the term loosely, to encompass, for example, straight-haired wigs) is VERY different from "black face," and cast POCs in roles that have traditionally been played by white people.
There is a controversy going right now about casting Zoe Saldana to play Nina Simone, because Nina Simone was discriminated against not only because she was African-American, but because she was very dark-skinned. Apparently, Zoe has to use prosthetics and makeup to look like her.
Not being a POC, I have no family stories about the beautiful mixed-race women who were chosen for performing roles while women with very dark skin were treated as ugly, even by other black people. I therefore only raise the question and do not provide any opinion on whether people of color who are light should wear makeup to play darker-skinned people, or even whether a light person should be cast for such a role at all. However, those questions are certainly looming at this moment.
Audrey
Audrey, the Phantom Phanatic, who nonetheless would rather be Jean Valjean, who knew how to make lemonade out of lemons.