Apparently the person who instigated the shutting down of the production was an African American girl who was passed over for the role of Esmeralda.
Of course, she has about the same ethnic claim on the role as a white actress--which is actually none. I see no evidence that she was more talented than the white actress chosen.
In this case, having a white actress is actually colorblind casting.
If the director chose an all white cast or just kept blacks to minor roles (none of which I can tell from the article) I understand the point of the protester. Otherwise, I'm not seeing much of a point here.