The problem with change is that it comes regardless of the obstacles in the way - governments won't be able to stop this long-term while they may win short-term battles. The problem with cryptocurrency is that it's pure game theory - it only takes one nation (cough cough Japan) to accept Bitcoin as a currency and support it economically before money starts shifting to their borders. People cashing in and out of Yen. How are you going to enforce it in another sovereign state?