If the different Human races were to have stayed Isolated would they have eventually become sub-species?

There is now some proof that blue eyed persons occurred from mixing with neanderthals. We already know that illnesses can be ped via our genes so its not ridiculous to think if we were confined to "our own" that we would not have been plagued with physical and mental illnesses. Every single society have their own cultural beliefs and traditions but most people in today's world regardless of race have an undeniably similar set of morals, whether they are simply learnt or a part of what being human is about i am not sure. In saying that we have come to this point today that our minds can determine what is right and what is not, so that states that this surely must be a part of our destiny, not just what one single race are made of. What a boring world we would live in if we were not to court with other races, not to explore other cultures or countries. If it weren't for the few that do wrong in society i wonder if questions like this would be asked. Even if all of us have some type of "mutant gene" that's okay with me it just adds flavor to what could otherwise be a very very different and scary world. In my eyes there is only the human race.