We will be depending on big oil for decades no doubt. And as we all know, it has many uses beyond gas guzzling vehicles. Plastics, rubber, fiber optics, etc.
By the by, my first car was a '68 Charger 383 magnum. Also had a '84 Trans Am. Luv those muscle cars. :-)
But DME is the purest clean burning bio-diesel fuel on the market. It's growing in Europe and the Asian markets.