It is my belief that if gas rose to 10.00 a gallon, people would continue to use it as we do today.
I know that isn't the case for everyone, ( me included) but they wouldn't need everyone to stay on gas if it got to be that high.
I'm betting that your metro cards and the public transportation prices would also shoot way up, although probably not at the rate that das went up. So no matter what, the oil industry execs would still make their money.
I basically agree with uriah and Sjohn. Until it brings the economy to a significant halt ( or pause) you won't see any real movement in gas prices (going down I mean). I doubt they would shoot up to 10.oo immediately, but I can easily see them hitting us with a nickel or dime a year until we get to that point.
For those of you who are still in school, if your university offers degrees in chemistry, or chemical engineering, a bet you that a booming industry that will be coming up VERY soon would be alternative fuel cell development.
Jlewis