Attila Dimedici writes: Tesla has announced that their business model has failed. Their basic idea was to sell a boutique electric car to fund the development of a regular consumer electric car. With this announcement they are saying that they did not sell enough of the Roadster to make producing it profitable. If that is the case, it is only a matter of time until Tesla closes its doors. I think this is a shame because I thought their approach was the most likely to create a successful fully electronic car. Although it is possible that the technology they have developed will allow the existing car companies to develop successful fully electronic cars, it is a shame that Tesla has failed to become a successful car manufacturer.