I do think you are correct regarding population growth, it has slowed significantly over the last 4-5 years and will need to pick up for a genuine price spike to occur.
Whether this can happen in the current economic environment remains to be seen. The substantial price difference between Brisbane and Sydney will draw people north as it always has when the opportunity to live debt free with cash in the bank is a reality. Population migration is an employment multiplier provided the new comers are skilled and are cashed up, jobs are created in many areas by the migration of people, this is despite unemployment being above 6%, it also was in 2003. I am not suggesting thats whats about to happen but the price differental has reached a point where something must give IMO.
Yeah, I'm not sure what will do it, but it will turn the corner eventually. You could be right, interstate migration could help increase jobs too.
If the lending restrictions (current or potentially added restrictions if they don't see the result they're looking for) slow markets in Sydney, it will probably do the same in other areas. The dollar going down could help QLD in general. If the price/demand of some resources went up at the same time, I guess all of the tax $$$ tend to funnel back to the SE for most of the infrastructure spending. Mining, tourism, infrastructure, government jobs, retail. Maybe in that order.
"While the fall in resources sector capital expenditure is a big drag on the State economy, Queensland has benefited from a surge in residential dwelling investment, a good rate of consumption growth, and a big increase in investment by the State and local governments in March quarter."
Residential investment is good, but it should be the other way around.

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