Every African country has a fairly large and even huge unskilled rural peasant population that generally flocks unrestrictedly to the big cities looking for work. These people have to live somewhere, and these shantytowns are generally where most of them end up living. I doubt this will change much in the foreseeable future even as the HDI of many of these countries continues to tick upwards. Though perhaps the share of nice areas in the cities will grow appreciably.
A country like China would also have this phenomenon if left unchecked but there the government structure is stronger and keeps a tighter lid and leash on stuff like internal migration and infrastructure and housing capacity and development.
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The Last Word.
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