bitcoin can't help an entire country,but can help individuals...and those individuals may be willing to help their country to grow economically and aid development
Yes i agree with you that bitcoin can surely help some particular individuals who are ready to work for it and use bitcoin as a currency like it has already helped many users,me included as well but i dont see how bitcoin can help an entire poor countries.
Even being poor countries their economy cant be changed just because people do earn bitcoins, it may help them to get a better life in the end, but its quite easy to say that they might earn a decent ammount.