The onset of urbanisation in China, and the associated boom in iron ore and coal prices triggered a series of echo-booms in Australia, and this is one of them.
Here is a brief timeline...
Echo-boom 1 - Mines
The first major boom was in bulk commodity prices and then in turn resources construction, as we constructed mega-mines and natural gas projects in order to export the in-demand commodities.
Some marginal producers will inevitably fail and smaller mines may become unviable as commodity prices revert towards their longer term averages, while others will continue to operate profitably, exporting iron ore, coal, copper, gold, LNG and other commodities overseas.
Commodity prices soared towards their dizzying peak nearly five years ago in June 2011 before softening demand and a ramp up in supply began the reversal. In turn resources construction peaked in the fourth quarter of 2012, and has been falling ever since, for nearly 3.5 years now.
While I don't necessarily agree with the intended policy - I don't originally hail from a capital city myself, after all - it is abundantly clear that infrastructure investment will be focussed very heavily on the capitals.