I think there are two points being made: (1) the TTC can't currently fit people getting out of their cars, and (2) that the benefit of any expense can be determined through thoughtful cost-benefit analysis.
People get to the subway station and hear about service delays and the system has no redundancy. Every day thousands and thousands at Bloor trying to go south watch subways which are already packed when they enter the station go by, often 3 or 4, before they can fit on the subway car. Likewise there are bus routes which are packed and they can't maintain their schedule worth crap. Should the priority be luring new riders when it is obvious that the current ridership is not handled in (a) service quality, (b) schedule reliability, (c) capacity, and (d) maintenance.
Politicians draw lines on a map and the TTC or Metrolinx instead of trying a hundred or more permutations of possible routes they only analyse the ones that politicians have come up with. The routes and the technology isn't determined by analysis of existing zoning and existing demand coupled with natural growth, instead it is determined by someone wanting something specific to go somewhere specific possibly with the promise of future re-zoning and intensification which is not guaranteed to occur.... and even with the imaginary zoning it still doesn't make sense through cost-benefit analysis.
This is no way to be running the TTC and Metrolinx.