There is no need for a Hub in West Africa, most airliners flying from Europe can make it to South America non stop. I flew the G550 from Buenos Aires to London non stop. Middle East airlines can make it non stop to the USA and the great circle route does not go over West Africa. The only people that might make use of it are the Russians and Chinese. Just don't think its feasible!!
Furthermore, the weather in West Africa is not stable enough for year round, safe, punctual operations.