Africa won't become a major manufacturing hub until companies can be relatively confident that violence and political turmoil won't destroy their investments.
One of the big reasons Asian countries are so popular is because of their proximity to other members of the supply chain. This is vital for maximizing JIT inventory management.
It might just end up moving to Asian countries that still have pockets of cheap labour e.g. Philippines.
>I'm really interested to see what happens after that though, when there is comparatively little wage arbitrage opportunities remaining.
Post-labor economies driven by efficiency improvements from technological advancement.
Most of the western world lives dissipatively save for a cohort of knowledge workers fighting for prestige and social proof. (You already see this in the startup industry with those who have enough money to retire on.)
Those that don't adapt to the non-necessity for everybody to be working will experience tumult.
I'm really interested to see what happens after that though, when there is comparatively little wage arbitrage opportunities remaining.