Bitcoin can be a useful tool, probably more at the international level of economic relations, but not for the people themselves, since people in such countries not only cannot afford the crypt, but also the Internet may not be accessible to everyone. And bitcoin will never replace the truly important reforms, education and infrastructure that are needed to fight poverty.
If Bitcoin is below $1k today, I believe people in a poor earning nation can afford to save up $100 in a year, using that to buy 0.1 Bitcoin and holding it to where Bitcoin is price today is something that will be a golden opportunity but that's in the past, most people wouldn't invest in Bitcoin because nobody really knew Bitcoin will be this big, some of them would have sold their Bitcoin half way journey especially the ones with difficulty to feed to put food on the table.
The only way right now Bitcoin can help the poor country is if they can offer gigs and service. Some poor nations are been faced wire transmission due to regulation, Bitcoin can be their best way to receive payment by offering services in platform that are allow fairness for everyone and give opportunity to earn. That's the only thing I think Bitcoin can do to help the less previlege countries and people that don't have much. This forum is a good example where you can offer services and earn through Bitcoin but the challenge is that you have to be a techy person.