[kijin]

Good points, but who said it had to be done in 5 years?

I was thinking more like 50 years, or maybe even 250 years. Without some sort of eugenics or singularity as you said, it will take a long time and a lot of effort to work around a psychological trait that has been ingrained in us for thousands of years. This is exactly the kind of progress that takes place most effectively at funerals.