I don't think it can change the whole economy rather it can help to other people to change their living base on finacial problem.
Maybe btc is one instrument to change the economy but btc is not the main factor.
We have different point of ideas about the Economy. My opinion on this topic is this, Bitcoin can only contribute or upgrade the life status of once individual with a huge earning from Bitcoin project investment. She or he can buy the goods they needs using the earning from Bitcoin. Our economic indicators are base on the supply and demands of Commodities that used in daily activity of the community or the people, like the Foods, Utilities products, Diesel and Gasoline. Any changes in this product specially the price will have some effects on the main stream economy, but Bitcoin can not simply change the Economic structures or fundamental. It may help in some way for the individual having some Bitcoin investor upon transaction of the said earning from Bitcoin but not change it.