don't forget to talk about de jure vs de facto.
this is really important relating to civil rights.
i.e. did it actually make that much difference, yes the law changed (de jure) but in the reality (de facto) given many local school boards deliberately rigged housing areas, bus routes etc to prevent black kids getting to 'white' only schools, there was still de facto segregation.
also tangible vs intagible - it might not have had a huge tangible impact (see answer above) but it did have an intangible benefit as it gave the black community and the many millions of whit people who supported their cause, belief that their time had finally come i.e. reform was now possible given the Supreme Court now appeared to be on their side. This was an intangible benefit - hugely motivational ruling.