I don't know. There's a lot standing in the way there. The entire continent has roughly the GDP of Italy. And while there are about 1.3 billion people, 70% have never been on the internet even once while many who have don't have a steady or regular connection.
The hopes are that they can get universal internet connectivity by 2030 but that doesn't mean you'll have 1.3 billion people actually using it by then or anywhere close. I'm thinking it happens elsewhere first.
They only need a mobile phone and nearly every adult has one. I was thinking not just Africa tbh, but also other countries with people living below the poverty line. Once they see friends and family gaining wealth by using crypto, it would be a no-brainer for them to easily adopt it also.
However, there are many challenges and you make some good points.