Who is "they"?
I think the real key is that our entire way of life will need to be retooled, so to speak. All the reasons people have for not driving less are geared to maintaining our lives as they have been in the last 10-15 years or so - the kids with activities in opposite directions, the jobs far away from the houses we bought so we could have bigger houses (or buy a house at all), all of the stuff we've bought to put in those houses...it all requires petroleum that's going to be much, much more expensive in the years to come before it becomes less available at any price.
So I think the question is not how much are we willing to drive less, but how much less of everything are we willing to do and buy, to be healthy and happy? Can we get to know our neighbors better (I have friends who have lived in an exurban neighborhood for 5 years know and have a passing relationship with only one family - but this is what our current economic system allows, and I don't think it's uncommon at all) and build truly localized communities where we grow food, teach our children, and pass handmedowns along instead of selling them? In other words, reduce waste and "extra" across the board.
Will Disney become a once-in-a-lifetime thing as it once was? Perhaps - but is this so terrible? Will our kids once again be willing to spend an afternoon "collecting" rocks and not be bored? Will families spend time together more and be busy less (did you hear about the home builder who admitted that one of his home designs was intended for families the members of which couldn't stand each other?) to talk, read, play games?
Not everything to come from $7+ gas will be bad. I think it's up to us what the experience will be.