Some 90% of the Africans live in poverty. But at the same time, there is a large community of the African nouveau riche, comprising of businessmen and migrants who have found jobs in the EU and North America. There are tens, if not hundreds of millions of people who use smartphones in the African continent. It will be foolish to ignore this large group.
90% where are you getting these stats from. Not even close according to this
http://www.our-africa.org/povertyYou don't need exchanges. You could have remittances coming in and then bitcoin circulating through the sale of goods and services
People are going to need a place to exchange coins for cash. They're not just going to want to barter for food or goods.
I guess he's pulling them out of a magic hat. People usually do that on the internet. To get a desirable effect on Africa we need someone powerful to take an initiative. We can discuss all we want here, but I doubt that anyone who is participating can do anything about it.
If Africa jumped directly towards Bitcoin, then both would benefits greatly.