"Smart Grid" utilities can even "borrow" electricity from a sitting car's battery when demand/price is high and "repay it with interest" when demand/price is low. Some CCS chargers and car models already support this idea, but it may be a while to see it in practice.
You generally don't need a full charged car at all times of the day: if you and your car both know you'll be at work for the next 8 hours and most likely you only need the 20 miles to get home, and a couple after work errands (plus some range floor for emergencies), there's plenty of leeway in how and when it charges.
