I think bitcoin will give a good effect for the economy of the country that has legalized the use of crypto currancy, economic growth will be better than the countries that do not use crypto currancy
Technology is the only factor that can boost your economy when all the remaining factors of production and employed at full level of employment. In such a case the output is increased by the use of technology like we have witnessed in Europe in the early 1990s.
Having said that, technology like Bitcoin can affect the economy of a country by making it easy for people to avoid extra costs, save more and employ people.