Again, you have to explain or specify a bit better what you mean by genetic superiority. However, I will assume that you mean that you are thinking of a time when everyone was smarter.
First of all, if everyone had "superior" genes, our social systems might be very different. If we were all equal, we might have societies that were much more equal and there would be less tension between rich and poor.
Second, if everyone were superior to what we are like now, we might be able to have more technology than we now have. We might have figured how to solve our problems.
But who knows. We might have just figured out better ways to destroy each other and we might not be around any more.