Unfortunately, instead of the outside world helping Africa to get to this point … the world instead uses Africa as just another place to exploit and make money out of. In the short sighted vision of the first world … it’s more lucrative to make a bunch of money now by taking advantage of poor dying people than it is to help them become productive members of the global economy.
I would argue it's more complex than that. The very conditions created by European colonization have resulted in extreme instability and corruption in the resulting, mostly-arbitrarily drawn states, which heavily discourages investment from rational (though amoral) actors. It's not that the rest of the world market doesn't want Africa to be more "Developing Southeast Asia" than "Place we get raw resources from", it's that the conditions European colonization foisted upon it make getting there from this point very difficult.