Their languages are missing several key things. They don't have a word for "maintenance". They can't describe something like "the monkey is halfway up the tree", all they can say is "the monkey is on the tree". People who can't even think of the idea of maintaining something because they don't even have a word for it are doomed to fail. Leaving them in Africa where they have year round access to food is their best shot as survival. They only have to worry about getting killed by other niggers.