Just to put a finer point on the timing aspect, it is not just that many black alums (I don’t want to speak on other communities I am not an active member of) feel that they just got to the point where there are a visible number of them with soon to be college age kids, but the anti-legacy push is on the heels of the affirmative action bans, so some folks see a double whammy that very much feels to them like a full set of factors that are conspiring to keep their offspring AND people like them, out of these schools in a way that has not been seen in a generation.
I do not see the legacy piece that way, but a lot of folks I respect and admire do, and I cannot say they are wrong in either that feeling or in the reality of what the changes will likely mean in terms of admissions and enrollment outcomes.