This is a good idea with continental cup instead national cup, but not only for african teams, also for american, european and asian nations, where the number of users at the end of the season is for example under 16 (which means they haven´t enough managers to fill their first league for the next season).
11 countries are in America under the 16 managers ... 92 clubs for american cup
7 countries in Africa ... 56 clubs for african cup
6 countries in Europe ... 58 clubs for european cup
9 countries in Asia ... 83 clubs for asian cup
I think it will be raised the competitiveness for some managers.
Other countries with 16 and more managers will be still played their national cups.