It's been a long time since I have been thinking this and haven't found answers but I do have some viewpoints. First of all let me describe the problem. We know that humans are the only species on earth to have the power of science and maths(knowledge) with them. Now this includes two versions of same species and those are male(humans) and female(humans).Now we all know that science and maths has been rapidly developing and is developing rapidly. Now as developments in science happen, we might(surely would) see a future where science has developed so much that there is no need for male-female interaction for birth of new babies and I think that probably in future, not many would love to marry or in other words, humans would create their offsprings with the help of science rather than coupling. Now once this is clarified, let's proceed to next point. Next point is that males and females till now have got along very well without any big conflict and the main reason goes to their interdependency for continued existence of both but once this interdependency breaks, would males and females see each other as competitors rather than partners? And would this cause a big war in future where one of the species would emerge as final winner?
Now I have been thinking long on this and there are certainly other ways this all could end and that is that with the help of science, males and females may combine to for single species and that is definitely super science fiction.