What in the theory of evolution through natural selection implies that all animals will become like humans or that humans will necessarily become more intelligent?
And humans are still evolving. How else does one explain the many differences in human populations (lactase persistence in milk drinking cultures, lactose intolerance in all other mammals, dark skin in human populations at equatorial regions, light skin in human populations where vitamin D is a necessity, prevalence of sickle cell anemia where malaria is endemic, etc etc etc).
Do not assume that the epitome of evolution is Homo sapien. I suspect that Mother Nature still has some tricks up her sleeve.