This is contrary to the principle of the functioning of the crypto currency, however, apparently, such claims, violating the right to anonymity, will be introduced later by many states.
This could have been seen coming a long time ago already. The main thing to note here is that Bitcoin is jumping into governmental territory, and as per themselves, every entity, tool, asset, or whatever, has to abide by their rules, even if it doesn't make sense for the outside world. That's why I am not so shocked about this, and yes, I do expect this to be a requirement in every country within a few years. However, we all have the option to not agree with all these control freak behavior regulations by making use of peer to peer markets. If we look at how much volume there is available in these peer to peer markets, it is clear that a lot people have already made the shift away from the centralized exchanges. It will go even so far, that exchanges will be forced to hand over every bit of precious user information to the respective tax authority of each country. It certainly makes you think.