Its not beyond the realms of possibility. But will be quite impressive if he pulls it off.
South Africa's next 8 tests are...
2 at home v Australia: Cape Town, Joburg
3 at home v Sri Lanka: Centurion, Durban & Cape Town
3 away v New Zealand: University Oval in Dunedin, Hamilton's Seddon Park & Basin Reserve in Wellington.
The ninth test will be in England and I think the venues for the ONLY 3 tests are The Oval, Lord's and Headingley.