All sorts of wonderful things can happen with $4/gallon gas, since that’s about where a number of alternatives become economically feasible.
The trouble is, of course, that the $4 is going to oil corporations (and their often-despotic vendors) and not to rebuild our own decrepit infrastructure.
“The postwar modern American city was built on a foundation of cheap gas that allows even low-paid workers to drive to and from their jobs. Take away the cheap gas and the foundation begins to crack.” Jeffrey Ball writing in the Wall Street Journal, 12 July 2004