how do you think construction works? especially in the united states? there are a lot of people living in the pits of suburban sprawl who cannot electively stop using cars tomorrow, and will not be able to electively stop using cars for years. they might as well be in electric vehicles rather than gas.
i love trains and bikes but the infrastructure doesn't exist and we're shitty at building it so I guess everybody in the lurch in the meantime is supposed to starve to death?