Predictable or unpredictable, betting against Pakistan in T-20 is not wise move unless they are playing against India. They are pretty solid team in T-20 format so i'm not expecting great things from the Proteas. They only had some chance in Test but they lost that too so from now on it should be easy for Pakistan.
I thought about betting for South Africa before the match but then after seeing the team i placed a bet on Pakistan and they played well but in the end it was a close match even though South Africa lost crucial wickets in the end. Even i am not expecting any great performance from South Africa but who knows if someone comes up with extra ordinary performance so that they could get a good price for the upcoming IPL auctions 
.