> However, if for whatever reason those students fail to perform, in the eyes of the non black colleagues, stereotypes of incompetence will be created, if not exacerbated.
It's not really a concern. Nobody's worried about competent students underperforming.
I really must be missing something. You even said it yourself:
"Nobody's worried about competent students underperforming."
I didn't say this, nor did you... so who are you replying to? Unless you assume all black students will be competent or somehow black students don't have regular instances of incompetence like their white, asian and hispanic peers?