In my view, country that adopts bitcoin will easily get out of their poor economic situation in a very short time.
Impossible. Every year there is (supposedly) billions of dollar in form of donations going to countries in need of help, but in all the years nothing has happened. In fact, things have become worse. Put that against a few individuals making $10-$20 per week, how on earth will this get an entire country out of its misery? If the incentive for improvement isn't coming from the governments there, then it will never happen.
The donations that are mostly collected on the name of needy people is misused, and they do not reach to the needy people and that is the reason that it shows not a positive progress, but I think if the mechanism for the distribution of donation make transparent then it will really show a good result and same is the case of bitcoin, if bitcoin is used in its true sense it can really help poor countries.