Both in science and in the industry things tend to progress in stages. It's very easy to sell an idea that advances one step ahead, but it's quite hard to make people buy your idea if you try to take a few steps with a single leap. That's why people with very radical ideas in science are often dismissed as crazies a priori.
On the other hand, I have seen some quite advanced car ideas in literature from as far as the late 1800s.
On the other hand, I have seen some quite advanced car ideas in literature from as far as the late 1800s.