日本*ピング* (kono risuto ni hairitai ka detai wo shirasete kudasai : let me know if you want on or off this list)
A Shinkansen in the US? Without Japan's small size population density where rail travel is usually more cost effective, and without massive Big Govt subsidies, I doubt it would work.
You fail to factor in that Third World development (China in particular) and demand for oil will make gasoline less affordable and passenger rail more viable.