actually what he said make a sense,
but it will affect the entire economy ? i doubt that it will.
Bitcoin has not prove its usability wholly because there're a lot of problems that we will face when people starting to adopt it in their real life.
for example the transaction and the fees itself,
what make it so special compared to other is its usability,but if the hype continue while nothing change i believe it'll be bad for Bitcoin itself in the future.
also CME listing is a bad move for Bitcoin right now but at the same time,
it's the trigger for people to know about it.
everything is like double edge sword for Bitcoin,they have their own advantage and disadvantage.
Well, I think it can affect global economy. Assume bitcoin is highly adopted by people who don't really care about it as a currency and solely consider it as a good investment. One day the price reaches something outrageous like $50k and people start selling evenrything, because they believe that this price is the best btc can do and the potential sums in fiat satisfy them a lot. So, the hell lot of btc is sold for local fiat. Next these people, having a lot of unexpected by governments money suddenly can afford to buy houses, cars etc. This results in devalvation of local currencies, thus leading the the world crisis.