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Before Apartheid was ended, the situation in South Africa was getting very bad. Black African unrest was high, violence (including armed violence) between Black and White South Africans was high, and the Apartheid regime was getting increasingly violent, suppressive and authoritarian to hold onto power (see the Internal Security Act of 1982). And all the while, the foreign media was exposing this to the world and the historic brutality of Apartheid was getting more attention paid to it as well.
What if Apartheid had continued in South Africa? Which I suppose is a question of what is the logical conclusion of what was going on in the 1980s had it not lead to the end of Apartheid? Frankly, how bad can it get?