What Spliff said. I was playing around with trips and fares on Continental's website the other day. What I realized as a passenger is that if I'm already willing to pay $399 round trip to see my best friend in PHX, another $50 or $70 in fare is NOT going to make or break the deal. And that's the way the majority of us are.
And just think of even how much better things will be once we lessen our dependance on oil in other venues (home power, cars, trucks, etc.) and/or find alternative fuels for jetliners.