One of the only issues I see with this is that poor countries do not have the computer or internet to use bitcoin. Because of this reason only, I do not think that bitcoin will be able to help these countries. I actually think it could hurt them if bitcoin would become a world currency.
I think you're referring to people that are really really really poor. Even third world countries like the Philippines, where I live, has an Internet connection. It might not be as fast as the US' and it's much much expensive than what most people has, but that's just how it is.
Even in poor countries, there would always be people who are "rich" enough to buy a phone that can access the Internet. That enough, can make somebody earn some Bitcoins, get enough money to buy a decent PC and have a modem for Internet connection. To be honest, lazy people are just using the "I have no computer" as an excuse. Everybody now has a smartphone and that is enough.