So they have the time and motivation to create laws like these but they won't create a law for a tax moratorium? There may be terrorists who use cryptocurrency but the majority of users will not be terrorists. What about the majority of users who want to use cryptocurrency for legitimate purposes?
Even if people believe these laws are a good idea as a means of combating terrorist finance it does not reveal how a practical implementation of this idea will work. How exactly can it be determined how much or how little or if anyone has digital currency? This would be as difficult as scrutinizing gamers who travel with their laptop to determine if their WoW items or Second Life characters tradeable for monetary value. In a sense, digital currency is just a tool of barter and barter has existed all along in various forms, whether it be MP3s, or URLs, or JPGs, or AVI, or cryptocurrency.
What this law will do is have an effect on individuals entering the US and it isn't clear if this applies to US citizens as well. Anyone entering the US who happens to hold a lot of cryptocurrency will be required to make it known, but what happens to the known crypto-rich who enter the US? How is this information intended to be used? Maybe we still have a long way to go before cryptocurrency is formally accepted by governments because right now the policies indicate the opposite.