Cant say about bitcoin economy,as it might get replace by some some improved cryptocurrency.but cryptocurrency economy will be huge and the cryptocurrency will be taken under capital gain asset by the government ,though they cant regulate it but it will be taxed to improve country economy.
And it sounds crazy, doesn't it? In some countries government doesn't make bitcoin legal or illegal, but want to get taxes from market. They don't want to take responsibility and regulate market... But how can they forget about taxes ?)