Earlier quoted context omitted.
All you can do is make it harder (not impossible, just harder) to openly mention race as a factor in hiring. Three people may decide independently to base their hiring decision on the race of a candidate without ever bringing it up. Hell they might do it without even admitting it to themselves. Maybe I'm wrong. But if you ever come to Auckland, NZ I could show you a lot of suspicious coincidences.
If what you were saying was true, there'd still be just as much racism in hiring as there was in the 50s. That's patently not the case. And that's not "all you can do". Societal attitudes regarding race have shifted dramatically over the past few decades.
We also banned discriminating against older people in the 60s, so it's not clear where to go from here.