Originally Posted by JustJames
I'm not convinced that we are evolving. I am convinced that evolution happens, and and happened to get us here, but modern medicine and lifestyles have largely severed the link between genetic "fit" and reproductive success.
Evolution is not some pre-ordained (that word again) progress towards an ideal, it is the result of many generations in which the recipients of advantageous attributes out-breed individuals with less useful attributes.
It could actually be quite sweeping. Think of the Neanderthal-Homo Sapien conflicts. Extinction of an entire race at the hands of the superior race. Might not be generations at all.
In that sense, our own extinction could be brutally sudden and unexpected. Nuclear war could do this, easy.