Any exchange in Belarus, Macedonia, Montenegro, Georgia, Moldova, Armenia? I'd say most African countries don't have any exchange, then, there's Asia.
I think those countries (the African ones) need remittance companies most. They act as a kind of exchange, actually. But I agree that Africa seems to be a huge (mostly) untapped potential market.
African nations first need to be educated enough to use the internet/smart phone in general. Bitcoin comes later...