You will not get another Shaun Pollock any time in the immediate future. Pollock is without question for mine the greatest ODI player of the modern era (he's got a pretty decent case for being the best bowler full-stop of the modern era, without the consideration of his skill with the bat) and there may never be his like again in the shorter game.
Bowlers of his parsimony are precious rare, less still bowlers who can be as lethal under the right circumstances.
SA need to realise that they cannot expect anyone to fill his shoes, same way Australia can't expect anyone to fill McGrath's or Warne's.
However, the second-best Test bowler in SA right now is a worrying question. There's no-one apart from Steyn who's not either not good enough yet or not seriously on the decline. Less still, there's no-one who offers even pretty decent control - as I say, Pollock-esque would be an unrealistic expectation, but SA could badly do with a bowler like Craig Matthews right now, who can keep a lid on things without offering no threat at all.
SA's ODI bowling looks exceptionally weak currently. Ntini isn't quite finished yet there, I hope. But Steyn is horrible in ODIs, Morkel isn't much better, Nel has never been as good as he could have been, Louw is clearly well short of international standard and should never even have been in the frame. And it goes on.