The high speed train is great no doubt about that, but here are the things to remember
In france for example it is not in people's culture to drive more than 2 hours when people have to drive long way they will take the train or fly.
The size of the countries where it has been implemented are very small which mean less of an expense compare to what it would be here.
So the question is this will people in the US start travelling by train more, and what will be the cost of doing this in a country as large as the US and will that cost be worth it?