There is significant land that could be developed now for low rise or single family homes.  It's referred to as the white belt.  The challenges to developing this land are the requirements for cities to meet increased density requirements put forward in the growth plan about a year ago.
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there is also onerous regulatory and planning processes that make land development a long process in areas where services have not yet been installed.
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I'm pro development but it must be smart.  The green belt is literally a legacy for future generations.  Pushing for improved density is also laudable, however the change was sudden and significant which threw a wrench into the development of the white belt.  Immigration and foreign money has simply been fuel to the flames that were already there.