Africa (the unbanked) is where we really need to push adoption. I guess the issue is not having the internet (wifi or 4G). Imagine if even 1 in 1000 people had a mobile phone & a BTC wallet or something.
I'm sure you've heard of Kenya's mPesa and all that. So, they do. The problem is they need extra money to invest in a very high-risk investment. Or, less pessimistically, they need to be able to exchange in-and-out of bitcoin with less fees than is incurred by using Western Union or something.