Bitcoin can not change the economy of the country. It's just money that you can pay off or earn it. To improve the economy, it is necessary to take action, and not to introduce a new currency.
A solid currency can in fact make a country or even the world more prosperous, when gold was used as the standard around the world we saw one of the biggest growth in investments in the world, because people know that their currency was stable, now that trade is based on the dollar and those dollar keep being printed as if they could print them forever governments are trying to get rid of their dollars as fast as possible.