I can't see how this will work when not a single electric car is aimed at families.
Living in London I am repeatedly told I should be driving a "green" car instead of my big Renault Espace diesel. The complaint I normally get is that diesel is dirty but as far as I can find while that is true for old diesels without modern filters (+10 years old) it isn't the case with the modern diesels.
Also I almost never drive anywhere with less than 6 people in the car and walk whenever the distance is within a mile and there is nothing bulky to transport.
I have done extensive research into available electric cars but they simply aren't big enough to fit more than 3 children or 4 in a pinch when they have grown out of the legally mandated child seats.
Until we see 6 and 7 seater electrics I don't see it as being anything other than a DINK statement to show off the "green credentials".