Just as Copernicus showed the universe does not revolve around the earth, Darwin showed the natural world does not revolve around humans; we are no more unique than any other species. Are we at least the pinnacle of evolution? According to Stephen Jay Gould, definitely not. If we were that would imply evolution has some direction and is progressive.
Gould argues that because natural selection works on whatever variability is to hand, small changes in the history of life can have big changes in what species of organisms evolve and how they occupy the environment. Therefore if life restarted from scratch the sorts of organisms alive 3-4 billion years later would be very different from those we observe today; there would most likely be no humans.
Gould’s argument is countered by some, such as Simon Conway Morris, who works in the Earth Sciences Department at Cambridge. Conway Morris is interested in convergent evolution; when evolution stumbles upon the same solution twice independently. For example the streamlined bodies of dolphins and fish, or the wings of bats and birds. He argues that similar environments can lead to the evolution of the same traits. So if life was re-run, there would eventually be a niche for a thinking, tool using bipedal organism and evolution would fill it with a human-like organism.