The funny thing is they keep yapping on about supply.  Ut the most in demand propertt is single family detached,  and how exactly do you add more of that to a mature neighbourhood without actually destroying said neighbourbood and its supply of single family homes in the process?

Take cabbage town or riverdale or the beaches, mainly in Demand fully detached or semi detached houses, but actually with very high densities. Only way yo increase housing  in those markets ia to tear down and build townhouses or low rise or even high rise...aka get rid of existing detached!

Meanwhile large swaths of scarborough and etobicoke are much, much lower density. Why not vary development fees for new construction​  based on existing density. Double or triple the fees for exiating mature areas with high density and reduce it for lower density areas with existing transit access. 

Otherwise there is no supply issue, just a speculation, empty hour and wait and see for fear of losing out issue....