Let me put it this way. I do not think any of these guys have completely understood how cryptocurrency works, or haven't got their minds to undertsanding it. I know he is a financial genius, but he is old and the world in which he lived in is gone. Einstein had difficulty accepting Quantum mechanics but the Copenhagen interpretation is the accepted one now. For example one might think that cryptocurrency with applications might find widespread acceptance, it seems to be the opposite. Some of the currently useless currency having perhaps faster transaction times may work. It is still an explosively evolving field. What happens here will be studied by economists in the future.