Tesla now has an edge on the technology front, but once the traditional European brands pick up, with technology that is better than Tesla (as assumed in the article), the question is if Tesla can keep it's market position. (This is in my opinion the main idea of the article)
I agree that the European brands came way too late into the game, and Tesla was clever enough to recognize this weak spot. But once Tesla starts building cheaper cars, will those who spend $70.000 on a car buy the "average" Tesla or a Mercedes, BMW or Porsche?
Don't get me wrong, I really admire Tesla for how much market share they were able to get in such a short period of time. Definitely well deserved and visionary! But it's indeed a question how this market will evolve further. This Austrian company might have an impact on it.