Fight to keep it? They already lost.
I hunted RSA several decades ago - at that time white South Africans were referring to their "leader" (F. W. de Klerk) as "de Carter" after our POTUS at the time. It was
not a term of endearment. General consensus was that the country was going to revert to tribal barbarism in a couple of decades - looks like the predictions are coming to pass.
S. Africa has punitive exit taxes that make it difficult/impossible to take any substantial portion of your net worth with you if you attempt to leave the country.
Well . . . in a country with lots of diamonds, there
are ways of exiting with value . . . although I've heard (but haven't been able to verify) that they try to restrict travel abroad by certain important people, e.g., paramedics, doctors, engineers, etc.