From the article:
Accordingly, our long-term price target for Bitcoin is approximately $400,000 per coin, based on taking the market cap of all the gold in the world and dividing it by the number of bitcoins that will ultimately be in circulation.
I wish he would state what exactly "long-term" means. If Bitcoin continues to survive over time then it's price will likely go up over the long-term The question is: Will it reach $400,000 in my lifetime?