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We've discussed this before. I think originally the genetic code was
robust, but over time due to the 2/ND law and missed errors in copying,
the robustness declined and continues to decline. This I
think was anticipated from the beginning of the genetic code and several
proofreading and repair machines were implanted into the code. But even
these proofreading and repair systems are subject to errors over time.
However, they still catch overwhelming numbers of mutations and corrects
them, but not all. The evidence I think supports this. Still, each
generation inherits the mutations from previous generations and develops
new mutations, all of which is passed on down. At some distant time the
genetic code in each species becomes increasingly less robust until
reproduction
ceases and we see this in many extinctions as recorded in the fossil
record.
If one looks at the fossil record with _no_ biases, I think what we find
is the abrupt appearance of most (if not all) species in the strata,
then long periods of stasis followed by sudden disappearance.
I think Dr Stephen J. Gould was an honest scientist who voiced what was
actually observed in the fossil record without bias or an overriding
commitment to convention.
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