Not likely any time soon. There's absolutely no way humans are going to pull >1000 lbs worth of batteries out of the car every day, and put the same >1000 lbs worth of batteries into it. With a unit of work of 50 lbs (reasonable for fit people), and a minute to pull out each pack, stow it away, take fresh pack and put it back in, it would take half an hour of hard physical work every day. No way regular people are going to do that.