A large part of this book, the part about artificial selection, is about the need
to replace natural selection. This does not mean that natural selection will cease or
go away. Evolutionary theory states that natural selection will always occur. It
occurs at many different levels from gametic selection where sperm compete and eggs
select different sperm all the way up to grand parental assistance with raising
children.
With wide use of artificial selection, natural selection will tend to focus on
different things. Humans will most likely always be in an arms race with diseases.
If most people are born with good health, brains and beauty, natural selection is
going to focus on more on subtle things or things that are harder to promote with
artificial selection. These will certainly include psychological balances that
are going to be hard to understand let alone recognize or manipulate.