@OP: You keep talking about the curve to mainstream and how peoples passion for the company and the dream doesn't impact this curve, I would have to contest this. As much as I hate Apple (for my own reasons) the reason they were successful was not just the cool sleek product that they released. They were not the first to make a decent MP3 player, they were behind by quite a few years. It was because of the way that Apple markets to people. Instead of telling people here is a cool product, and this is why you need it... They tell people that, hey we understand you... We are right there with you in this, believe in us, and we will make that happen... Oh yeah, and here is a product that goes toward that goal. That's why almost all people who own an apple product either got it because "it's an Apple" or because someone else got/convinced them to get it for that reason.
Tesla is working very much down the same path, and historically this has been the best marketing strategy (Apple is not the only one). It's why there are no, or very few, Prior Tesla owners who hated the car outright. Almost all the hate comes from people who have not bought into the car/company yet... And their opinion should not deflect you from an otherwise great product.
As far as crossing into the mainstream curve, I don't think Tesla or anyone expects that to happen until the Model E. All signs point to them doing at least 100k on their first year, when it is released, and jumping very rapidly toward 1 million a year. Given the latest consumer reports perception survey (which is basically a measure of people's opinions and not any real facts), Tesla now sits at number 5, in perception behind Toyota, ford, Chevy, and I think Honda. That is a really great place to be in their second year. I wouldn't think there will be any issue selling a 40k car.