As long as young pilots emerge from flight schools with flying licenses in their pockets, SA and the like will have pilots to fly the jets. As long as SA and they're ilk have sufficient Capt's to fly with these young guys and gals, the jets will continue to fly. There's nothing to stop this process, unless you can convince people to voluntarily stay away. The young guys are looking well beyond the bad pay at the supplemental's. The guys in the left seats make enough to be satisfied to the extent they don't leave.
I would suggest that the level of negativity toward SA posted here is meant to chase away potential new hires as they stand in the way of any improvements for the pilot trying to make a career there. And, nobody wants to make a career at an airline with a revolving door. I don't either.
In 1988 I was paid $75/hr as an F/O in a DC-8 freighter with a 70hr guarantee. How can this be, especially considering the alleged pilot shortage?....Not in the US anyway.
By the way, SA had no trouble filling the two most recent 777 classes so how can anyone expect anything to change. Supply and demand...