I'm not suggesting it as a strategy for this recession--it's already far too late. But trying to time transit projects with downturns would be good policy, and ought to be feasible. The problem is that governments tend to be flush with cash during booms, but are hesitant to invest in subway/Pearson reconstruction-scale infrastructure projects as they are inflationary and tend to go over-budget and be late.
Given that we have downturns every 5 years or so (if measured by a series of rate cuts by the BoC), it would put us out much to try to gear large infrastructure projects to be countercyclical.