The really promising thing is in the chart showing the battery degradation depending on the depth of discharge. With 25% - 50% depth of discharge (i.e. charging

The really promising thing is in the chart showing the battery degradation depending on the depth of discharge. With 25% - 50% depth of discharge (i.e. charging and discharging between 50%-75% and 100% of capacity), the degradation is minimal. You might not be able to keep your battery in this range while driving long distances but for commuting it's certainly possible and - now the good part - it's definitely possible when the car is plugged in. That means it can support the grid ("vehicle to grid") without having severe long term effects on the range of the car.