Norbert, I think you answer your own questions when you note that "opinions about Tesla's future are unusually polarized". TSLA is a volatile stock because (IMO) the market believes that Tesla will either deliver a great car in the Model S or they won't deliver at all. The nay-sayers short the stock, the believers buy it. Once a number of successful Model S deliveries are completed it would be fair to expect the total volume of shorts to decrease; if they decrease dramatically then the stock will see a lasting positive effect and I agree with your implication that TSLA will then start to be regarded with more standard measurements.