Well nothing in science is “proven”, and it is a well accepted theory because it EXPLAINS and PREDICTS facts (while creationism is useless towards explaining and predicting).
What mechanism stops “micro” evolution from becoming “macro” evolution?
The rate of mutation we see is more than sufficient to explain a 2% genetic and 6% genomic difference between humans and chimps over some six million years.
Obviously you think there WAS no six million years to be had, but is that your only defense, not enough time?
What mechanism would stop a 2% genetic and 6% genomic change from accumulating within a species over six million years?
Where is there ANY evidence for this “devolution” you speak of? Can you point to a single species, in the wild or in the lab, that went extinct due to accumulation of detrimental mutations? Is this what killed the dinosaurs?
Is the dog a “de-evolved” wolf? They certainly seem to be at no loss as far as the abilities they were selected for. They sure do not seem “de-evolved” to me.
The pure-bred dogs contains DNA that is less viable than the wolf. Also it has been generally accepted that over 80% of all the different species to inhabit the earth are now extinct.