Although Australia geographically is a large country, let's face it, most Australia's live in the large cities on the coast, which are all as big as any other large international cities.
People often say "Oh, because Australia has a low population, they're not all living on top of each other like some countries", but that isn't the case. Australian cities are no less crowded than any other cities in the world.
The next problem is that 95% (probably more), of Australia's new immigrants are going to the large costal cities. If Australia keeps allowing mass immigration, Australia cities will just become overpopulated, polluted, unpleasent places to live.
If Australia wishes to expand it's population, then I feel it's going to have to build cities in the interior, in my opinion, the coast is full, 20 million is the capacity. If you add up the land area of all the big Australian cities, you get about the land area of Ireland.
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