Let's see... We pay 2-3 times less than the Netherlands for gas. Our population density is ~140th in the world while the Netherlands' is 15th. The Netherland's name literally means "low countries" while many cities in the U.S. rest in hilly areas.

I'd say give erosion a couple hundred million years or wait a couple thousand for the U.S. to approach the Netherlands' population density and we should start using uprights more. Until then, feel free to get off your high horse and recognize that biking in the U.S. is primarily the pursuit of fit people, and just because they like faster bikes doesn't mean they're vain egoists who put fashion above pragmatism.