If you look at what's been done with the new E-Tron, Audi has already said that they wont be stocking any models at their dealerships. Don't know how people could buy into a brand new platform without at least taking a test drive. I know that's also been the case for a lot of Tesla owners.
When you're already familiar with a brand its easy to justify buying a new version without even seeing it. Its like how people pre-order smartphones before testing it in person.