Opel Rak-e

Volkswagen Nils

Nissan Land Glider

I would really like to see these cars move forward from concept to production. They are perfect for commuter cars, specially for car sharing programs since the running cost would be minimal. Any of those above would be iconic and would bring a lot of free press to the automaker. Like the Model S did for Tesla Motors.
Let’s say this to automakers:
https://www.facebook.com/OpelRake