Not just car sales, car manufacturing is being disrupted as we speak. Elon Musk is going to do long term damage to the car companies that refuse to move into the future. He's already hurt the sales of the high end automobile and hurt these manufacturers. The rapid fire attempts to build electric cars by the luxury brands are the signs of the damage he's doing.
These companies don't publish sales numbers but I'm willing to bet he's taken at least 1/4 of their business by how quickly they are trying to respond to a market they all said was pointless two years ago. In fact I can remember statements by Porsche a couple years ago that the electric car is a joke, bet it's not funny anymore!