To be fair, though, we theoretically don't need the car industry at all. Tesla is building an electric industry to solve the emissions problem created by a transportation industry that does not need to exist.
Take NYC for example. MTA enables transportation to just about anywhere in the city, all through an electric, mass-transit trolley system.
If we look at the history of municipal transportation, it looks pretty clear that trolleys were winning over the majority of the car industry up until GM took over trolleys[1] and shut them down to essentially require people to own cars to do any transportation outside of biking and walking.
I think what Tesla is doing is wonderful, but I feel like the problem they are having to solve didn't need to exist in the first place, and the petrol car industry got us in a bad situation.
[1] http://en.wikipedia.org/wiki/General_Motors_streetcar_conspi...