Plenty. Overseas engineers have what no remaining SA engineers have. Experience. Engineers in training I'm afraid ain't worth diddly until they have 10-20 years experience under their belts. They too will emigrate to gain this experience because they can't get it in SA. Whether they will return is open to debate.
When the AA laws were passed and blood was (and still is being) spilled experienced engineers left SA and they won't come back. Those that didn't emigrate retired. The institutional memory is gone. What took 100 years to build up is gone. The only way to recover is to import these skills at the going international rate and that rate isn't R50,000 per month it's 3 to 4 times that. The NIA isn't helping matters, nor is home affairs.