I'd wager that upwards of 75% of the non-aviary Australian sections in US zoos can be recreated with the emu, red kangaroo, and Bennett's wallaby. From that perspective (and I'm not saying it's a good one, but it's no doubt going to be a common one as we've already seen), Australia may well actually be considered "complete".
I'll reiterate my first post in this thread that I'm just glad that Australia is finally usable at a baseline level. We still only have a bare minimum number of options to distinguish one zoo's Oceania (read: Australia) section from the next, but at least we finally do have proper options. At bare minimum I'd still like to see a tree kangaroo, the devil, short-beaked echidna, and North Island brown kiwi.
Personally I could do without the devil, and I likely wouldn't use the kiwi often, but I'm not going to ignore that they're both important for different reasons.
I've been meaning to actually start a life list of species seen in zoos, but off the top of my head, here's the Oceanian species I've seen:
- Red kangaroo
- Western grey kangaroo
- Matschie's tree kangaroo
- Bennett's wallaby
- Swamp wallaby
- Koala
- Southern hairy-nosed wombat
- Short-beaked echidna
- Emu
- Southern cassowary
- Black swan
- Cape barren goose
- Victoria crowned pigeon
- Kunekune (lol)
And then the ones that wouldn't work as habitat species, probably (an arbitrary breakpoint but I wanted to split the list up):
- Laughing kookaburra
- Tawny frogmouth
- Rainbow lorikeet
- Budgerigar
- Sulphur-crested cockatoo
- Queensland redclaw
- Magnificent tree frog
- Spiny-tailed monitor
- Frilled lizard
- Australian water dragon