> This is my fear with everyone eventually plugging in their electric vehicles at 5pm

Household- or neighborhood-scale battery banks make a lot of sense in the near term. Because they are stationary they don't need to emphasize light materials and can focus more on cost efficiency and charge/discharge rate than mass or energy density using more readily available materials and cheap production methods. With relatively simple BMS you can charge your EV now and recharge the battery at off-peak times if you need to use it again in the evening (lots of people do).