It is quite astonishing that Australia is the 6th largest nation on the planet and yet only has 4 major zoos (Taronga, Melbourne, Adelaide and Perth). No offense intended to ZooChat members such as Steve Robinson who run wildlife parks or smaller collections. Of course there are the 3 open-range parks, some aquariums, and a large number of smaller wildlife parks with mainly indigenous animals. The sunshine and calm weather has actually aided in the creation of the numerous wildlife parks, as it is easier to remain open longer and appeal to Australia's many tourists. There are so many of those tiny parks, each with a small assortment of exotics, that even for a hardcore zoo fan such as myself I'm still not aware of all of the little centres of wildlife scattered throughout the vast country down under.
To answer the main question of this thread, I would certainly look elsewhere if I were looking into opening a major zoo. The incredible limitations on importing wildlife into the country makes Australia a battleground for those with aspirations of creating a large-scale zoo. For someone such as myself, who is used to touring the big American collections, seeing 17 zoos, aquariums and wildlife parks around Australia was a shock in terms of the diversity of animals. For example: there are more species of cat at the Cincinnati Zoo than showcased in the entire nation of Australia, more species of bear at the Cleveland Zoo than all of Oz, and more species of hoofstock at single American zoos than the majority of Aussies have seen in their lives. I can visit one large American zoo and see more diversity than all of the Australian animal collections COMBINED. Why would anyone want to spend millions and open a zoo when 80% of the animals that they would like to showcase are off limits?
Naturally I still love Aussie zoos for the native wildlife, which are well worth the price of a trip down under all by themselves.

But for anyone wanting to open a large, urban zoo that has all of the A's, B's and C's of the animal kingdom, then they should really be looking somewhere else to realize their dreams.