not gonna happen. People Just wont trust it. Just like mass trasport with "flying cars" are not going to happen this century. High speed rail (200+ mph), an

not gonna happen. People Just wont trust it. Just like mass trasport with "flying cars" are not going to happen this century. High speed rail (200+ mph), and smaller cars for city transport will prevail. Wait until gas hits 6$/gallon, and then you will see the change on american attitudes to transport. I remind you that the population density of USA is about 31/km², while europe's is about 112/km², and appart NYC, there are no really very dense areas in this country. Even SF has about half of the density of the average European city. So even if the population doubles in the next 50 years, current technology (or the model of life you see in Europe), will be enough. Anything else too drastic, will probably be too expensive to develop.