There's a big difference between achieving a certain level of industrialization and "taking the reins" as you like to put it which would mean supplanting China.
SA has been invited to join the BRIC(now BRICS) however one of the argument against was the relatively small size of its economy compared to the other members. To keep your analogy, they're traveling in the buggy but far from taking any reins. There's no way in my opinion that we will see any african country become a major economic player like China this century.