What's interesting is that this was published in 2015.  At that time, Bitcoin had had a $20B market cap.  It will be insane if this prophecy comes true, but 8 years later in 2023, it seems like a probable scenario.

($8 trillion market cap means 16x, even though the global GDP has increased by more than 25% since 2015: https://data.worldbank.org/indicator/NY.GDP.MKTP.CD)