And I personally think Africa will become the next China, just as China replaced S. Korea, that replaced Japan and so on for cheap labor. I see it as a good thing. This cycle has left all of those countries better off than before.
There is a major difference between most African countries and most Asian countries, and that is a strong, stable government. This as political stability is a requirement for businesses to thrive. In too many countries, larger companies need their own private army to protect their factories. You don't need that in China, or even Myanmar. Those countries are far more stable than most African countries. (note: in this argument I don't care about WHAT KIND OF government there is, just that it is STABLE).
Secondly, China alone has a far larger population than the whole of Africa. And even China is currently suffering from serious labour shortages, with factories not being able to take on more orders as they don't have the people to manufacture them.
I agree with you that Africa is a great candidate to become the next low-cost manufacturing hub, however first they'll have to get their politics in order. A stable government, that is firmly in power, and that rules the whole country, not just the big cities. Factories need space, they're not in the cities, they're out of the cities. Without proper safety there, and at least a half-decent protection of land ownership, it's a no-go.