It could help Africa if they realize and open their eyes and mind about technology. They have a resource from their country, and if they can manage with the help of blockchain, then I think that will have a good impact on their economy. But we don't know how far it could give benefits to them as they need to use the blockchain and approve the blockchain to be used in their country. If they succeed in using the blockchain, I think they can be role models for the other country to following Africa.
The present of the blockchain in Africa will help that country to reduce corruption as long as the government is willing to fight corruption. But if it's not, then it might difficult to see blockchain will grow in that country.