As with all multicultural empires throughout history; the Mongol, Greek, Roman, Byzantine, Ottoman, British, Portuguese & Spanish Empires - South Africa will too fall & disintegrate. Balkanise as it were. These are the losses of territory that could happen in future as the South African chapter comes to an end.
20 March 1991: A day before the independence of Namibia. The South African Empire is at it's maximum extent.
Present day South Africa. Namibia (German Southwest Africa) is gone & has become an independent state.
2030: Venda, KwaZulu & Northern Cape have left South Africa. Northern Cape possibly joins the Western Cape to form a bigger state. Lesotho either becomes part of South Africa or gains parts of the Free State to extend their territory.