Having just travelled on almost every shinkansen line in Japan over the past 2 weeks (highly recommend it for any railfan), I honestly do not see why high-speed rail here cannot be a success, especially if travel times are within 4 hours. Windsor, a city of 218,000 people (and more importantly, Detroit, with a pop of 600K) takes over three hours to drive to from Toronto. Compare this to Niigata city on the Joetsu shinkansen (810K), and populations are fairly similar for a similar distance. Trains on the Joetsu Shinkansen run at speeds of 240 km/h, and see 43 million passengers annually. With a line length of 270 km, it's pretty similar to that of the proposed HSR. What has to be noted that in both scenarios (tokyo-Niigata/Toronto-Detroit), the driving times are at least 4 hrs without traffic, while high-speed lines would take 2 hrs to traverse. While the population of Tokyo is much larger than that of Toronto, it's still fair to say that there is a lot of potential benefit that can arise from building this line, especially since unlike the Joetsu shinkansen, the HSR requires almost no tunnels here.