From what has been written and said there maybe a fair amount of backroom bargaining going on which until a satisfactory solution is found for Zuma, which is agreeable to him, he will hang on. The other option is that the NEC has finally decided that enough is enough and unless the get rid of Zuma, the ANC will continue to suffer and be seen as all members being corrupt because of the lack of action. This lack is already being seen as acceptance of the corruption and state capture, which is costing the party a huge loss of voter support. They-the NEC-will have to step up to the plate and make the decision to recall him and let Jacob Zuma face the music. This will give them some credibility and help regain support that he has cost them.
However that may be a pipe dream and they will continue as before