"I tend to think of bitcoin as an experiment. It is an interesting experiment, but it's not a permanent feature of our lives. We are over-emphasizing bitcoin, we should broaden it out to blockchain, which will have other applications."
Being able to short a financial instrument is important for price discovery.
"Financial theory says that if something is not shortable then it can be taken over by enthusiasts, and the doubters can no longer have an adequate way of vetting against. We've just seen that both the Cboe and CME have both created futures markets for bitcoin and that might make it more stable."