They are a trade deficit country right? They depend on stuff that other people make so they can buy it.

And the freedom to finally create an all-white Australia, and end up tearing each other apart in racial civil war.

isn't asia connected to europe!!?
The link (land connection) between russia and america and therefore europe is sketchy at best, sub zero temperatures etc so probably america would be safe. Africa the same but given the stupidity of humans, no doubt there would be floods of boats going over there.

Well if the virus only made it to Europe as seen in the film (Paris), then surely Asia, Africa & North/South America would also be thriving not just Australia.

Haha yeah. Madagascar is just a reference / meme about a mobile game called "Pandemic" where it's often rather resilient.

madagascar has bubonic plague, they're going to be wiped out sooner or later regardless of zombie apocalypse hypotheticals.

Clearly Madagaskar would win if they closed the airports.
Australia is very uncertain - some drunken Aussie would hop in his boat and bring back some zombies from India just for beep and giggles.

surely having no one to trade with or imports, movies, music, holidays, medicine break throughs, etc etc would make it a lonely place?
Australia would be rich sure, but by what standards, their own?