To fly Nationwide now would probably be the safest you can feel in South Africa...knowing that the aircraft have been thoroughly checked, just a few days ago!!!
They have released their schedules that would be operated untill 22 December...basically all routes would be served once daily (except MQP), and JNB-GRJ mostly 2x daily and a few days JNB-CPT 2x daily.
Although the first few flights yesterday and today was very poor loads, it seems that it would be picking up tomorrow and over the weekend, with prices being higher. The 1 flight Friday JNB-GRJ is actually full.