My guess is, while everyone else is making fossil fuel cars more efficient and selling them to the trend settin fossils who buy them to somehow justify their idiotic belief that buying a slighlty less polluting car will help in someway, and not just so they can save £25 driving into london, that Mercedes will shove the fuel cell in a c-class and take the enviroment head on.
100% recycleable, 0 emmissons, and you can seat 4 people in the same traffic jam in comfort.
Now that will be the way forward.