It's one thing to be a gainfully employed member of a white owned company and another to be the newly crowned owner of a property you have just confiscated and have no frickin idea how to run it...........
Same thing happened in Cuba when the Castro regime took control and confiscated all properties from both the corporations and the campesinos who were not supportive of the Marxist Castro.....
There was no one left with the knowledge to run the companies and the private farms that were taken over by the regime........
Black South Africans could watch what was unfolding on their northern border (in Zimbabwe) and see the writing on the wall; Mandela begged whites not to leave, because it would leave a country without skilled or educated workers (doctors, mechanics, etc.). While power & wealth would be shared with blacks, whites themselves were still going to be in a better position than most blacks. Now that they aren’t feeling so secure, they are jumping ship.