I'm actually more worried about flying than about individual transport. I'd argue that affordable intercontinental flights have had a tremendously positive effect on the world's society as a whole. The intensified relationships make war between industrialized nations very unlikely for the time being. Yet we don't really have any feasible alternative to fossil fuel there at the moment. The sooner we save it for those important matters the better, but unfortunately that's not how free market economy works. I expect we'll have a period where flying is a privilege again.