(Being a Chinese grew up in Canada, and now working/living in the Bay) In my opinion, most people in the valley or in North America still refuse to give up their lifestyle. They look for something like self-driving cars, all electric-powered "personal" vehicle to invest. And those still drive on the same road/interstates/highway infrastructure and don't give you the benefits compare with high-speed rails. They don't…
You're using the rail example to imply downfall, and yet the US economy has embarrassed the Japanese economy the last 25 years. In the mid 1980s, the US and Japan nearly had the same GDP per capita; very soon the US will have twice the GDP per capita of Japan.
You're implying rail is so beneficial to economic growth, and let's say I agree with that: and yet the US has been embarrassing most of Europe on economic growth for the last 20 years (Germany's economy hasn't expanded in ten years for example).
If you were right, US GDP per capita should be far lower than the EU or Eurozone, when the exact opposite is the case. Germany has a GDP per capita of the poorest US states (it's nearly on par with West Virginia currently). France nearly has the GDP per capita of Puerto Rico.
I don't believe your premise has any legs to stand on based on the facts. The real implication here is that the US would be staggeringly far ahead if it corrected some of its obvious flaws.