I guess it depends on the idea of the concept car vs show piece of future production. I think some of the concept cars that GM/Ford/Dodge sometimes display are obviously concept cars that will never see the light of day. However, Tesla isn't really at that stage. So when they show a concept, it needs to be closer to reality. Toyota had a concept Rav 4 a few years ago that I really liked and had hoped they would put into production, they never did and it was extremely disappointing.

I guess what I'm saying is, if it's going to be a concept car, make it so outlandish that no one will believe it will be production.