I know a couple of guys with several properties each, that have this plan of action. Pay off the bond, except for R100 to keep it open and if **** hits the fan, they can quickly empty the bond and take the cash out of country, leaving the banks to fight over what's left.
How do you quickly empty your bond? And then how do you just take the cash out of the country? You need reserve bank clearances, bank approvals, etc etc. These days that could take months. If they have access bonds, then they could withdraw the access portion quickly, but then just transferring large sums of money offshore isn't that easy and anyway if the shtf probably wouldn't get much for it.