Maybe Jaguar were a bit like Empeg, the concept was great, but it was a bit too early to be widely accepted.
The difference being Jaguar couldn't make it work, Empeg made it work brilliantly!
I think GM have a working concept car with fuel cells, or one of those tchnologies, which has the equivalent of fly by wire steering, the controls simply slide from the right side, to the wrong side for you Americans and Europeans!