It seems like a pretty good idea if no other technologies are found.
As steem-buzz posted graphene technology may be the future.
It requires little atom thin pieces of graphene to hold a huge amount of power as well as to charge in seconds.
I don't know how quickly this will be mass produced but it could be a contender in the markets @davidp
Agreed the battery technology is the key to making it successful from a user standpoint. Also as a side note from a resale standpoint!!! Ask yourself do you want to buy a used electric car with a battery inside that could cost 5-7k to replace it if its bad? So to me they really need to perfect the battery situation. But the copper is in the wiring like an aircraft.