[reasonisfaith]

Species is not defined by percent genomic difference.

So the answer is no, 2% difference does nothing to establish speciation.

As for the last question of your post—if 1% per 20,000 years were a relationship from which an accurate equation could be derived, it would tell us we would see 100% change in 2 million years. But even evolutionists would never accept this, given real world observations.

Speciation is a myth.

[allmendream]

What establishes speciation is when two different lines that formerly could reproduce fertile offspring can no longer do so.

The “myth” has been observed. Just like Australopithocine, ignoring it doesn't make it go away.

What are the real world observations that would preclude the accumulation of a 100% difference in noncoding DNA given enough time? Functional constraints would, of course, limit the amount of change tolerated in genetic DNA.

You haven't even explained what would preclude the accumulation of the KNOWN amount of difference, some 2% genetic and 6% genomic, that has theoretically accumulated between humans and apes over some seven million years.

What would preclude two separate populations of the same species from accumulating enough differences in DNA over time that they could no longer reproduce between groups after sufficient time and the accompanying INEVITABLE change in DNA?