Like I said before, African economies and Africa improving itself may come much faster than expected. There was a study on Ghana stating that fertility rates there declined faster than expected and now moreso with Ghana’s three child policy. But it could quickly turn into a two child policy for some regions especially if the government puts more effort in prolonging children’s education.
(So are Uganda, Rwanda and Ethiopia, the latter two were that affected by disaster but which Rwanda recovered real quickly.)
Botswana’s fertility declined even further, becoming closer to the much needed replacement level (2). Even life expectancies are prolonging, with Ghana, Kenya and Rwanda becoming closer to the ones in North Africa (70 plus). If healthcare improves substantially, it’ll converge too closely to the point of becoming the same. In fact such changes may already be on their way and may come sooner than expected.