They may well have won the 2007 RWC and the 2009 Tri-Nations using their kick and chase game plan, but the game has moved on since.
Back then, tacklers and tackle assists were not being made to show a clear release before going for the ball. The Boks in particular were very adept at grasping the ball carrier and putting him on the ground while maintaining their feet and standing in the gate. The result was frequent turnovers because the ball carrier had no chance to play it back to a team mate.
In 2010, the SANZAR referees were given clear instructions that tacklers and tackle assists must clearly release the ball carrier. I posted this stats chart at the time to show how dramatically that affected the game.
BD = Breakdowns
TO = Turnovers
BD-TO% = the percentage of Breakdowns that result in Turnovers
In 2009, in matches involving South Africa, 28% (almost 1 in 3) tackles/breakdowns resulted in a turnover. In matches not involving South Africa, that rate dropped to 20% (1 in 5)
In 2010, when the "daylight" calls came in, the number of tackles/breakdowns increased by 43% (showing greater willingness by players to take the ball into contact), but the number of resulting turnovers dropped to less than 15% (1 in 6)
Conclusion. The tactics of 2009 didn't work in 2010 and they are unlikely to work now.