For me the most important thing here is... what about taxes?? If the system is P2P and anonymous, why paying taxes if they don't know how much money I have?. Imagine a world where all salaries will be paid using P2P transactions. The IRS will never know how much I earned last year unless they come to my house and make me show them. They only could obtain money from fines and exported goods... Moreover, moving money among countries would be free for everyone not just rich people (You just have to move yourself to another country with your computer or mobile phone).