I'm not sure that you're aware of what can be done...you're basing your argument on the relative cost of transit projects but then you completely fudge the numbers. Why on earth would a Sheppard extension cost that much? The Spadina extension to Hwy 7 is slightly longer but is projected, after inflation and with vehicles, to cost $2.6 billion, and that includes a full half billion dollars of padding, not to mention tunnelling through largely empty land, elaborate stations, etc. The cost would be lowered even further if multiple subway projects were underway so that we didn't have to reinvent the wheel every time. Transit City, projected to cost over $8 billion, is hardly a cheap alternative.