The current trimming of the corrupt troika tree, as evidenced in a few notable "falls" such as Molefe, Koko, Motsoeneng, Ntlemeza, Phalane could be seen as just a tactical withdrawal of the corrupt, state capture project.  
These pawns are forsaken to distract their enemies from the real offensive yet to come.  The combination of legislation in the pipeline (Land, Mines, Hate Speech/Censorship and more) and the renewed commitment to the NDR are proof of this. 

Oosthuizen is displaying wishful thinking when he states; "History will judge the silent majority in the party harshly, for lounging around as one scandal after another smears the ANC".

There is no "silent majority", there are no "good" ANC cadres. The National Democratic revolution rules.  

The ANC has played its historical liberating role and has lost its relevance. We now yearn for (and need) modern, pragmatic governance untrammelled by outmoded revolutionary ideology.