Agreed. They have been accepting black players for a long time now and some of them have established themselves as legends in the world of Cricket.
Players like Rabada etc are some great examples. They just need a solid captain like Smith to guide them.
Rabada is nowhere near legends such as Alan Donald or Dale Steyn. And even if we consider him as one of the success stories of the quota system, for every success there are 10 unsuccessful experiments such as Bavuma and Pehlukwayo. I don't even want to mention dozens of promising players, who quit South Africa because they felt humiliated after being told that they couldn't be selected because of their skin color. What happened before 1994 is bad. But that shouldn't be used as a justification to discriminate against a racial group, especially those who born after 1994.