No, they don't. Heard of China? Growth in China? That shit makes capitalists giddy. And when the guys at Goldman Sachs are happy, your political elite smiles too. Would they like 800 million africans to become another china? Yes, they would. Industrialization of a nation does not make it's raw materials more expensive. Africa's cheap labour is of little use to the west (or china) (extraction of raw materials is not labour intensive, africas commercial agriculture is underdeveloped). Growth in africa would not hurt the evil imperialists.
Considering the catastrophe* de-colonization in africa has been the smugness of those who dismiss all ideas carrying the faintest whiff of colonialism is nauseating.
*Africa is the only continent on earth were falling levels of gdp per capita has been the norm in several countries. THis picture becomes bleaker if you consider the fact that the increase in gdp per capita is from resource extraction that brings little benefits to the people. De-colonization was a disaster on the scale of maos great leap forward.