Maybe, people buying a Series 7 are wealthy people that want a family car. And for the raw performance, they need enough to boast, but what they really need is a luxurious interior. Wealthy people looking for performance look at sports car.

Anyway, they will change their car in 4 years. There is no reason for them to suffer through the early adopter problems (not good enough charging network, only in the silicon valley you don't look stupid if you tell your friend you can go in the south of France buying wine this we because there is not charging station on the way), they will simply buy when the future is there.