For me, it depends on the usage of cryptocurrency will be because if it will use to some legal proposes that the government has rules and implementations, especially in pay some taxes, it will be tough to both sides that make it worst. But if the usage is all about in fast and alternative transactions, it will boost the economy because of less queue, less transaction fees, quick, etc. But it will only happen if the establishment and costumer agree to the regulations that the government will implement. In short, it will boost the economy if cryptocurrency becomes legal and accepted by the state.