In my opinion, Africa doesn't need missionaries from other continents in the same way they may have in past generations. Africa needs Africans, whatever colour, to be trained to minister to their own people.
A salutary word to many of the mission agencies among whom it has been all the rage to talk about (and prioritise) reaching the unreached. Whilst I understand this zeal for evangelization, I have become convinced that for most of sub Saharan Africa what is most needed is not so much the reaching of the lost, as it is to disciple of the nations. This in fact is what Jesus calls the Church to do and something that is often overlooked in the Great Commission.