Can we stop with the whole "why are there no monkeys turning into humans" and "why are there still monkeys" arguments? Please, it is pathetic now. These kind of arguments only demonstrate a complete lack of education and tell us that you are not interested in facts.
The first one, if any species ever evolved more human traits it would still not be a homosapien, it would be a completely different species from us. This is also assuming that our set of traits is always beneficial for all species in all environs, and that is laughable at best.
Evolution has no direction, none, humans are not the goal. Our particular set of traits contain a lot of vestigial traits and many flaws. It is only by our intelligence that we have over come these flaws before we were driven extinct, and then many still plague us. The real advantage we have is the combination of traits, all our individual traits appear in other species in varying degrees.
Your first hurdle with the argument of why nothing else evolves into humans is that you have to demonstrate evolution is directional. The whale demonstrates how lacking in direction evolution is, so you have a lot of work to do before you can convince anyone you have a point.
The second one is so ignorant I feel pity for those who ask why there are still monkeys. This argument is the same as asking why you have aunts, uncles, cousins, and distant relatives. Yes, monkeys are very distant relatives, chimps are closer, and other apes are practically the same family.
This leads me to the third idiotic argument, sorry religious nuts, we are apes. We are animals, because our traits are what we use to define such things. Evolution has nothing to do with us being apes or animals, this is just basic biology.