If it is just a matter of investment to get up to those 20k-30k/hr capacities, would it not make sense to pursue them? I mean, we can wait 50 years for a subway to do the same job, or try to fully leverage our rail ROWs. I don't think Metrolinx has said we will continue to use the same type of rolling stock for the higher frequency electrified service.
Of course it would make sense. I just doubt we are at the point where such investment has been made, or is being made.