If they arent going away, then where are they? This should be something almost anyone can rig to a petal bike or a soap box racer, right?
As is I think we truely only have one successful hybrid vehicle on the road, th Prius. We may have a few with an EV, however it looks like the Leaf has battery issues just like the Volt.
I doubt neither Honda or Chevy has sold enough to be profitable. Thats why I didnt say Insight, HCH, etc as to be successful for the company they need to sell enough to be profitable.
As I recall UPS had a delivery truck with this equipped for testing purposes? Cant say I ever seen a truck come to my house that was equipped with the system.