Japan is a very viable country for crypto growth, because so far they have proven to be able to control its use, and implement it into their banks are well structured.
Japan is one of the most successful country technology wise in the world and this is why they have never ever refused to implement or at least give a try to new technology in their country. Japan is the one which is providing maximum support to crypto currencies and I am sure there economy must have gone through drastic improvement. I hope and its my strong desire that rest of the states also learn something in this regard from japan.