"I'll probably feel slightly nostalgic about the sound and smell of fuel-burning cars someday"

I don't know about the smell, but once people realize how dangerous is a car you can't hear coming, they will start adding some sound, and what's better than a traditional car sound? The sound will be easily faked using samples from well known engines played according to the current speed by transducers under the car. There will be probably a market for such addons and traditional auto makers could even patent their sound once they realize there is a market for their recordings. Allowing paid download in realtime of "today's hottest car sound" in seconds when you start the car in the morning could become a business, so that news like someone arrested for pirating the sound of a 911 Carrera could even become the norm one day:)