Even if Mugabe goes, his replacement will likely be as bad (or worse). Sub-Saharan Africa is headed right back to the stone age under the twin woes of socialist/communist black leadership and AIDS. I see no indication of possible change.
What got sub-Sahara Africa temporarily out of the stone age was its conquest and colonization by Europeans. Europe and the US no longer have any interest on re-colonizing Africa.
It is indeed a dire situation.
Without the West that these "leaders" procalim to hate so much these clowns would be as you said back to prehistory. I can only imagine a 700 series Benz being pulled by donkeys in the presidential motorcade.