I live in MN where the price has bounced around anywhere from $2.80-$4.00 in the past year. Personally, I think in some states/areas where the cost of living is higher, gas prices could certainly hit $6/gallon because it would be far more socially acceptable than gas hitting $6/gallon in areas that have a low cost of living. However, I do believe there will come a time when gas becomes so expensive, that some people will simply not be able to afford to drive to work or school. For single parent families commuting, its not crazy to think they might spend $5,000-$6,000 a year in fuel. I know all the wealthy car lounge folks here probably don't have a problem with that, but for a young single person such as myself with an average job, after rent, car payment and food, there's not much left.
Hopefully it never comes to that, but I foresee some serious economic issues brewing around fuel costs.