I know this discussion doesn't necessarily surround 'Taronga' - but I'll continue it here since it mainly extended from discussions about management of their species.
That can be said with most species - but not in the cases
@Zorro mentioned. There are a lot of facilities open to import/acquire animals, but are being shut down!
It was reported (last year I think) that most sanctuaries in Asia are currently rife with TB so that rules out them being considered as options for potential import. Furthermore, a lot of the bears that were initially rescued had/have behavioural problems which has impacted their abilities to breed. So there's ultimately little application for them within a breeding program.
Populations in Europe and North America also aren't doing too well - so it's hard to see where a future for Sun Bears regionally lie.