Yes they have, but there might be some hope:
"Volkswagen's current CEO, Bernd Pischetsrieder, is said to have decided that it was not cost-effective to continue further with the one-litre programme. However, less revolutionary "three-litre" models (capable of over 94mpg) are still underway, despite low sales of the earlier Lupo 3L and Audi A3 3L offered in Germany"
Source:
http://www.channel4.com/4car/news/ne...?news_id=12096
If things are developing in the right direction, sooner or later someone will make a car look towards this shape. There is a hope from VW perhaps! A Honda Insight with diesel would also be cool!
*edit* Hey, just noticed! Take a look at Honda Imas. What a CAR!
