In Canada, affirmative action transformed workplaces from white cliques to truly multi ethnic environments. It worked really well.
But we don't have the cultural deficit that slavery left behind in the United States, we had a lot of capable immigrants who weren't being given a fair chance for bogus reasons.
In the US affirmative action has also been reasonably successful for women, who were being shut out of careers they have proved well qualified for.
The problem in the US is the catastrophe that slavery left behind, even hundreds of years later. Systematic, institutionalized racial violence that was explicit under slavery but continues in various ways for hundreds of years.
The civil rights movement didn't happen until the 60s, and for many blacks, still hasn't happened yet.
This is a really tough problem to solve. No magic wand will make it go away, but if you do nothing it lingers.
Despite the obvious problems I will say that you needed to augment and expand these programs, only restructured so that it isn't only "Kashawn" that suffers.
There is no cheap nor easy way to solve this problem. I think you have to bite the bullet and drag the nation kicking and screaming into a world of enforced equally, despite the mismatched abilities.
Other wise you go on with an abyss st the center of the nation.