Well he could be right about governments. They definitely like to keep their money close, and want to know where it comes from and where it goes, and bitcoin causes a very big problem for them, so if it gets to big they will act. The thing is, unless you live in a very strict country, I don't think they will say it is illegal. But take a look to Venezuela, where mining is not even illegal, and they are still chased by the police.
So for me, most countries will find other ways to collect taxes from it. Japan is doing a fine job in using bitcoins, so maybe the majority of the world will be able to act like them.
Maybe they will follow Japan, but not at the moment. Think that most wait to see how will it be with them, after all they are first to fully adopt bitcoin in every day payment.
BUt tricky part will be government in all possible way, yes, they like to keep money close but we are in technological era and almost everything is send online, maybe they are considering and trying to create some alternate or some government blockchian, have someone consider this as option.