He probably giving his personal opinion and should not be thinking like a economist, one of the biggest problems of people when they do not like something is talk with feelings and not analyze the situation very carefully. As the years pass the price of bitcoin will increase and more countries will adopt bitcoin, how could the price fall to  $100? countries like Japan, Malta, North Korea are a great example of how it may be possible to use bitcoin legally. This economist said his personal opinion and did not speak as an economist.