I though from a conservation standpoint want as many weapons at our disposal to aid in the preservation of this species. Yes other captive breeding programs have failed, but the string of births at cincinnati, have shown they have "ironed out" the problems. This needs to be explored as a viable option. I am not saying the rhinos should be in every zoo collection, but breeding programs in well funded zoos i.e. Bronx, Cincinnati, Omaha, LA, with multiple enclosures in the same facility for the species would be a major assist.
I think the time for distributing specimens of Sumatran rhino randomly to any more zoos outside Asia is now past. Its been done once and didn't work. Even though much more is known about them now, there are still obstacles to successful breeding. Yes, Cincinnati has certainly ironed out most, if not all the problems, at least with the one breeding female/pair. Hopefully they'll be able to somehow repeat this success with her daughter(Suci) too if she is allowed to stay where she is.
At present there are four potential breeding females in captivity- two at Cincinnati, two at Way Kambas(plus the third much older one) I think only when all four of these are breeding successfully should any thought be given to possibly removing any more animals from the wild, with one exception- one more male will be needed if Cincinnati is to continue breeding in the longer term.