Consider what might happen if Zuma goes.  Lets assume that a clean replacement is voted in as president and that he/she makes a point of REALLY dealing with and cleaning out corruption, and dealing with the most corrupt.  SAP, Hawks, NPA are read the riot act, with leaders dismissed if they dont do their jobs of arresting the corrupt, investigating cases, and charging them in court.  At least the top 20 most corrupt go to prison, including the Guptas and Zuma..  A little bit of integrity could go a long way, and the focus of government changes to what it should be rather than just trying to steal.  Then and maybe then the ANC stands a chance of winning the 2019 elections.