I'm afraid this is not that straightforward
You can get better just by your neighbor getting worse. This may not sound very good and may in fact be despicable (especially if you deliberately go for that), but this is how things stand between many countries. So while Bitcoin may not be able to improve the economy of a country directly, it can still heavily undermine the economy of some other country. Bitcoin is a pyramid scheme (whether you like it or not), and if it grows too much and gets out of hand (think Btc-e here), it could certainly damage it. My point is that Bitcoin can be used as a sort of economic weapon to make smaller and weaker economies bleed while bigger and stronger ones suck on them