The Rand is very devalued, there IS a limit on how much money is allowed to be taken out of that country, and America, Australia, Holland, the UK, etc. will NOT take them in; not to mention the fact that getting an exit VISA is just about IMPOSSIBLE!
As to the devalued Rand and restrictions on withdrawals from SA banks, it's my understanding that the wealthier landowners in SA like in Zimbabwe often kept their liquid assets in foreign banks in in hard foreign currencies for these reasons. That leaves those without such resources in a very bad bind.
Concerning western countries not taking these people as refugees, I said in another post that as far as the US is concerned, there's some hope that under the Trump administration they will be allowed in as legitimate refugees. Mike Pompeo has expressed concern over ANC land seizures, so with any luck he'll get to work on this and get a sympathetic ear from the President.