I wonder if once Tesla fights back all the local monopoly regulation around dealerships, this will naturally transition to an online car dealership. They'll have to figure out test drives though.
I would actually prefer this to a dealership since a real owner probably knows that one car he/she drives everyday way better than the lazy sales guy who is trying to sell 10 different models and rarely drives them himself.
Then again I didn't think Uber could work and now I take them all the time so who knows!
OTOH, this doesn't do much for specific used cars.