They could just bring an example test drive car to the home of any potential customers for an hour or so for them to try. If the customer likes it they can then just order a new car via either the person whom is with the test drive car, or through the Tesla web site.
With everything now moving towards being brought to us at home/work, it kind of makes sense to do the same with something like a car. It sounded odd when I first heard about it, but the more that I think about it, the more that I think that this could work for them.
Matt