Unless you are traveling in a Toyota Prius with 4 people, as gas goes up and if the airlines passed on 100% of the cost, ticket/drive cost favors flying.
The VLJ trade groups will also have a hard time with their powerpoint slides. They have been touting a pretty good case to gain airline pax. As jet fuel goes up they will find it harder to sell the business models.
For the first time, the industry might have to shrink to profitability. Never worked before because someone else was always adding. Now that most of the labor contracts have been gutted they will have to work together and control supply and cause a net reduction in seats.