I believe supply was something that stopped them from acquiring them back when they were planned for the Carnivores precinct.
With the new hatchlings at the Reptile Park I'd hope a few of the regions zoo will be able to be supplied with a dragon. Melbourne's current Peccary exhibit is suitable for them; but if they want to go the route of having them in Carnivores (like they did initially), they could be accommodated in the Tasmanian Devil enclosures there.
I like the idea of Komodo dragon replacing Tasmanian devil in the Carnivores precinct. It’s bad enough we have Dingo in the Carnivores precinct, but Tasmanian devil are definitely one for the native precinct. There was very little visitor interest in either of these species on my visit versus the African lions, Sumatran tiger and Snow leopards, which were attracting huge crowds.
I’ll be interested to see how the Binturong work out in the Carnviores precinct long term. They made for a very underwhelming exhibit on my visits, but they were a recent addition and have hopefully grown in confidence in the months that have followed.