I don't really agree with declaring our crypto assets because I know that some governments would tend to manipulate it. The idea of bitcoin is having a decentralized transactions, and that's what we deserve to preserve.
Of course they will use it for their own advantage. If you declare your coins they can demand proof of ownership like an address. If they get your addresses this will be like signing the coins with your name. If those coins ever end up in the hands of criminals they will harass you and demand to be given the list of all your payments and clients. No thank you!