Hi Paulzmay,
This was a well reasoned post. But it was hypothetical. Where is all the capital for these lines going to come from? The government. Where will it go? To the place most likely to generate re-election votes. Where will it be administered? Visit any USA department of motor vehicles.
Do we need that?
Bernie
It's only hypothetical in the USA

The evidence from elsewhere also seems to be that people need little persuasion to use high speed rail when it is provided, and when rising oil prices and airport security are factored in even Amtrak (with decades of under-investment) is seeing it's highest ridership ever.
Paul