In my experience many educated Africans from many countries (maybe not all) have a sense of continental African pride etc. and I always thought Africans in a game like BB would be okay with a regional or continental league. BUt I don't want to assume, its important to hear the opinion of Africans in Africa if they prefer their nationality league or an African league with better competition/more users.
We sure do take pride in our continent! For now, I think it might be better to have regional/continental leagues so the competition isn't too boring. Problems might arise, though, such as people wanting to play in their country only, rivalries between countries in a region, U21/NT matches, etc.