Nonsense. There is so much land available in the places to grow act, its ridiculous. Developers are speculating sitting on said parcels waiting higher prices. If anything there should be a built it or lose it provision in lands assigned to the places to grow act...you ahve x years to build or you lose title. 

If anything the greenbelt should be expanded outwards to stop developers from jumping further afield and creating even more sprawl and commuting nightmares...