I may be misunderstanding what you're suggesting by this but it seems that
we're suggesting that a population becoming more similar (stabilizing)
doesn't involve a change in the population.  I understand the definition of
evolution to be a change in the frequency of alleles within a population.
In a simple example, if the initial population was 0.5 A and 0.5 a, and
stabilizing selection caused the population to become 0.6 A and 0.4 a, then
the population evolved (changed).  If it become more similar and was then
0.7 A and 0.3 a, the population evolved further.  My point is that
evolution is not measured by the variability of the population but rather
by the frequency of alleles in the population.

If I misunderstood your point, my apologies.

Todd Ryan

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