The major industry that is going to benefit from Bitcoin revolution in Africa would be remittances. According to Wikipedia, about 20 to 30 million immigrants from Africa send around $40 billion USD annually to their families and local communities back home. In several fragile states, remittances are estimated to exceed
50 percent of GDP.Most African countries restrict the payment of remittances to banks, which in turn, typically enter into exclusive arrangements with large money transfer companies, like Western Union or Money Gram, to operate on their behalf. This results in limited competition and limited access for consumers, which allows these Money Transfer Operators (MTOs) to charge the highest fees for remittances in the world.
Bitcoin remittance startups like BitPesa, Abra, Remitano, Bitspark, and GeoPay are taking the power away from large MTOs by offering low fee for remittances.
The next is payments industry, especially mobile/smartphone based money transfer. Right now it is dominated by M-Pesa. Right now there isn't something like M-Pesa for Bitcoin, but maybe in future. Most important is to target the unbanked, many startups are working on it.
Don't know whether cryptocurrencies would haul Africa on par with the rest of the world, but there could be drastic changes in the socio-economic conditions of African nations.
https://en.m.wikipedia.org/wiki/Remittance