Bitcoin can't help an entire country. but it can surely help the person who use bitcoin if he's poor. and if a country have a lot of bitcoin users then it will surely be beneficial and for that country.
bitcoin need some contribution. if you contribute with bitcoin and crypto currencies . they will reward you for sure. but if you think bitcoin should give you fortune without doing anything just because you are a poor person then keep dreaming.
Good example is me, I m not poor but I m son of a small shopkeeper so putting my money on bitcoin is risky still with courage I did and now I m earning good sum. One more thing , bitcoin could indirectly help a county's economy.