Where is the market?

Jane Hamsher at Firedog Lake makes an interesting point - The Big Three contend that their marketing problems will be solved with greener vehicles. Hamsher asks where are the sales of green vehicles to date. And, now that the price of oil has dropped by almost $100 a barrel, where will the sales of green vehicles be tomorrow? We went through the last oil crisis pledging to wean ourselves from oil. Did we do it once gas was available and the price was cheap? Have we really learned anything?