I don't get some of the comments here. Of course what he says is true. The policies that were put in place that limit supply for a desirable home (particularly for those with a family) drive up prices. It is a contributing factor and a significant one for detached and semi-detached homes. 

That doesn't mean we scratch the policy though. If we get rid of the policy it would help in the short-term but eventually the amount of land near business cores would cease to exist and again we would run out of supply, only faster than now given we would open up low-density development. So in the long-term the problem would come back.

He's not wrong in that it has exacerbated the current situation, but that doesn't make the policy bad, it's the other factors driving up prices that need to be looked at.  We won't all get to own a detached home, that's life, not the worst problem to have.