Human evolution is a natural process with infinite potentials. We are not yet a finished product! In fact, there is no limit to the levels of evolution we can achieve, both as individuals and as a world society. We have within our capacity the ability to guide our own development as consciousness beings, and many of us are doing exactly that.
Humanity as a sum total however, seems to be limited by its own concepts of life and right living. The only real limitations upon our continued growth as a species, are those concepts we continue to impose upon each succeeding generation.