Battery cost going up is a temporary situation due to the production not ramping up fast enough to meet demand. That should only last a couple of years. For people that can't park in a garage, a weekly fast charge should be enough, no one is doing more than 500km per week, at least in europe. Fast charging networks keep on improving and they are catching up quite fast. Recharging times are also going down continously, and I can imagine that in 8 years they should be at least half of the current best. Innovation in battery is going very fast