It's never brought to the courts because there's no law about it. Complain to Congress; it's their job.
I barely even need to point out that Republicans didn't need to be scared into opposing legacy admissions, as they eagerly supported them, for people who might be taken in by their meritocratic facade from the decision yesterday.
This is all documented in The Price of Admission (https://www.amazon.com/Price-Admission-Americas-Colleges-Out...).