This is all completely irrelevant, and has been discussed to death. The price of the lithium in the Tesla battery is on the order of $150. If it goes up to $1500 because we run out of easily extractable resources, it's going to be economical to extract it from seawater, where there is 230 trillion kilograms of it. Also, it might be economical to recycle the lithium from old batteries (currently it's just not worth it).