You really should have a look at this very cool interactive map of the worlds population centres (all 476 of them above 1M.)
http://www.citypopulation.de/world/Agglomerations.html
I have pulled some figures from this source for a new perspective.
The site ranks all Principal Agglomerations of the world exceeding 1M people. We have 2 in the Top 100. China has 16, the USA has 14, India has 9, Brazil has 7, Japan has 3.
Here are our cities according to them as at 01/01/2009.
Quote:
Rank............City...............Pop Est 2008
77 ............ Sydney ............. 4,400,000
92 ............ Melbourne .......... 3,900,000
227 .......... Brisbane ............. 1,920,000
282 .......... Perth ................. 1,600,000
400 .......... Adelaide ............. 1,170,000
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BTW, it is silly to suggest that any city in Aus will overtake another within 50 years. The growth rates of each respective city are not big enough to change the order.