It's chicken and egg. It will come, our grids are not ready, but perhaps these batteries can also discharge fast and you can charge your home battery during the day, charge your car when you come home, charge it through induction as your drive over a special track of highway. Many things are possible in the future, but we have to grow into it. In any case, this super fast charging is mostly relevant (as said in this thread) road side, where you can have special equipment. At home you can mostly charge over night.