Natures way of evening us out?

Over the years what with advancements in science, medicine and technology occurring at a faster and faster rate and building upon each other, physical abilities have become less of a need and more superfluous; and with the end of natural selection occurring many years ago, do you think it is possible for our intellectual capabilities to exceed some "capacity threshold" and send us backwards into a time of equal intellectual and physical need? It seems possible, even ominous, what with all the negative activities the human race is becoming oh, so skilled at.