Then lets never build another subway line again. Now, lets put the ridership of Yonge onto an LRT. King and Queen streetcars show you what high ridership is like.. Some routes should be streetcar/LRT. Some should be Subway. Cost is important, but moving people efficiently should be a high priority.
As a taxpayer, I would like the most efficient use of resources to move those people.
Just because you have decreed that it should be a subway rather than a mode that is cheaper but still capable of carrying everyone who wants to travel does not fit that bill.