Delivering said energy to over a billion cars all over the world is pretty impossible. As things stand right now that's an entire continent (Africa) which in many places doesn't have reliable power even for basic things like keeping the hospitals running (they have to use diesel generators and the like).
But, then again, this EV-vehicle "revolution" is targeted at the Western middle-classes + China, they can afford to not care about the rest of the world as they've done until now.
