Cabinet changes for political rather than governance reasons will affect provinces ito inter-level communication. But provinces have their mandates until the next election and budgets for the year so I'll wager that impact is minimal. More important is the long-term, systemic failure of the public sector to deliver services. 
Reviewing six themes - ethics, resource optimisation, etc - David Fourie and Wayne Poggenpoel (2017) say 'findings resurfaced, on average, 6.17 years in a nine-year period. Key challenges have less than a 50% chance of being resolved, if at all. These recurrences imply overall the public sector struggles to address functional and process issues that affect efficient and effective delivery of services.' 
Public sector workers are the new elite. From cleaner to CEO, politician and cadre they're paid 30-40% more than they're worth without a concomitant sense of duty, accountability and efficiency. And it's happening in the WC and CoCT too, so don't be complacent.