I foresee a skirt model always being available but I bet the Vintage goes away with the Thunderstroke. I predict a modern, water cooled, inline 3 or 4 will eventually replace the air cooled motors as emission standards become harder and harder to meet. Those will go into a new 'midsize' family of vehicles that will include a few skirt models. All of this is 100% my own personal theory based on circumstance only. There is an equal chance that I'm wat off.