Will electric cars ever enter the mainstream?

Pardon my metaphor, but is the tank half-empty or half-full when it comes to electric cars? The bad news: start-up electric-car makers Aptera, Better Place, Coda and Fisker are out of business, or close to it. Of the 14.4m cars sold last year in the US, only 52,835 – one out of every 270 cars sold...