The most vehement opponents of the crazy idea of stealing money from those on medical aids are blacks who are getting into the job market. (Take a look at the numbers - there are far more black medical aid members than there are whites in the country.) They are paying an uncomfortable portion of their income on medical aid schemes for the simple reason that they are desperate to protect themselves and their families from the ruins of a state health system that has been run down to the point of extinction during 22 years of ANC rule. 
The ploy to steal funds from the private sector in a desperate attempt to prop up the system that they themselves have consistently undermined will deliver a crushing blow to the very people who are moving into the job market, which is where we want everyone else to enter into.
Have the brilliant planner thought how a mere R22 billion p.a. can possibly fund a viable NHI scheme? This is just socialist smoke an mirrors with the base aim of winning the votes.