It's true, there are many corridors and routes, and not just on the coasts, where HSR would be quite feasible in America. The problem is that Americans refuse to see this and refuse to accept train travel as acceptable. You can talk until you're blue in the face about how many people transit regularly between LA and SF, or between DC and NYC and Boston, or between Houston and Dallas, and Americans will simply counter that a train between NYC and LA takes too long, and therefore trains are a completely unworkable solution anywhere in the whole country.

There's just no political will to implement true HSR in America and I don't think there ever will be.