This guy is probably high. The trust built within Bitcoin isn't easily be erased and a 0$ price is impossible.
Currency failure have happened before and however if government around the world unite to fight bitcoin and label anyone still trading it as illegal and can be sued then rest assured the price will drop to $0. We never really know what the future of bitcoin will be and I want to enjoy it without doubt. So far countries in various part of the world are considering issuing their own cryptocurrency which is centralized under the auspice of bank. Bitcoin give us freedom because it is decentralized, but the government is constantly trying to make everything centralized including its own cryptocurrency.
It would take a global ban for BTC which is most probably not gonna happen. World leaders are divided in terms of adoption but institutions and companies are stepping up by choosing BTC. We can't stop these anti-decentralisation government to have their own cryptocurrency for they want full control over their assets. Furthermore, Bitcoins decentralisation is what makes investors trust it. No other than you can only control your money and free from money printing spree.