The problem is manpower and  resources though. There is not near enough to track each and every Bitcoin and crypto user. It takes hundreds of millions and tens of thousands of people to do this... way more than it is worth. Then you add the fact that each coin has its own configuration/setup... they are not identical and then we have others like Monero which are literally 100% anonymous and impossible to trace. I just don't see how governments will be able to get around these obstacles.