These conversations, largely based on what ifs, tend to miss the point anyway.
Even before colonization, even before the various empires from history largely from what we call Europe today or the far east, very little of Africa was headed for some sort of utopian dream.
Very similar to North and South American native cultures before colonization most of Africa was loosely organized into tribal, territorial, and waring cultures. Not about right or wrong, good or bad, but just the reality of how some cultures advanced over history against others. Eventually collisions occurred. And it is easy to argue that various outside influences, empire expansions to awkward trade from vary early globalization efforts to various colonization efforts to even religious influences, made matters worse. No denying that, but it is narrowminded to say "the British cancelled African dreams" ignoring every other factor that occurred on that continent going back a very long way.
None of this conversation, or my statements, change anything.
We are now here, and our options are growing more limited the further we go for anyone to have a dream realized (in the history sense.)