How convenient that the common ancestor of human beings and apes is extinct?

Potassium-argon dating has proven that the human species has drastically evolved from an ape-like creature over a bare minimum of 3,000,000 years. More specifically, I am referring to the fossilized skeleton of the "Dikika child" (DIH-kee-kah), named for the region of the discovery site in 2006. These remains offered an unprecedented view of childhood growth in a species that evolved to a midway point between apes and humans, according to the team led by Zeresenay Alemseged of Germany's Max Planck Institute for Evolutionary Anthropology.