The Audi E-Tron has already been nerfed from its original concept. It is no longer the radical hotness that the original concept claimed it would be. I really don't see the point in designing concepts that rely on technology that does not exist. I mean why not design a concept car that runs off of a quantum nucleonic reactor? It is about as useful. I think Fisker set the bar for the automotive industry in concept design. The concept was delightfully inspiring and the production car lost nearly nothing. The interior actually improved over the 70's sci-fi concept. The only thing lacking in substance on the concept was the B-pillar, which it is my understanding that designers purposely leave out in concepts because it makes getting interior shots easier at autoshows.