I don't see why even one of the companies doesn't try to corner the market for solar or hydro cars and make a fat profit as a result. Seriously, we already have the tech and the means to distribute it within the next 5 years in major cities as is. I don't see why they're stalling as the transportation costs of all this stuff would keep them in oil profits for years to come, many more jobs are created, and when the switchover is complete, they're already earning a steady cashflow from the new resource.