What SHOULD have happened was once Taylor and Broom started feeling comfortable and getting on top Vettori should've called the power play and attempted to deliver a knockout blow. Clark wouldn't of even been bowling.
South Africa leave it to the last few overs, that's fine because they've usually still got decent batters or Morkel at the crease. There's no point in NZ and Australia trying to copy them when they don't have the same players.
Besides, I thought powerplays were there to make the 15-40 over mark more exciting. So much for that theory.