Even with having won the majority in Jozi, the ANC has lost another good 10% and it is starting to look very dim for them for 2019. The initial predictions in January 2016 was that the ANC will lose 5-8% per election and it would take a good 10 years for an opposition party to come in - this picture has dramatically changed and I doubt the ANC will maintain national leadership in 2019.
The party would have to make some dramatic changes (scrape e-tolls, fire Zuma and fire most executives in parastatals) in order to restore confidence. Considering their arrogance and lack of leadership/vision, I doubt this will happen. I hope that in Jozi the DA, EFF and IFP form a coalition and EFF/IFP help the DA understand how to properly address housing/basic services for people who have been sh*tt*** into buckets for the last 20 years under ANC rule and restore dignity to people having not received what was promised by the current government for two decades.