[Coyoteman]

The statement amounts to a claim that human population density is now too great for the sort of isolation of small groups which Gould, Eldridge and others claim is needed for "speciation events" to occur, i.e. that PE could not occur amongst humans under present conditions.

Really? When was the last time you bred with an individual from the deepest African rain forests or the Kalahari Desert?

[Southack]

Cross-breeding is insufficient to explain speciation because the first two speciation events of life (i.e. abiogenesis and then the 2nd species to form) had no such cross-breeding options.

Further, the author of this article is claiming that mutations and new species are more possible with 10,000 pre-humans than with 6 billion modern humans.

That dog won’t hunt. For that matter, even the “isolation leads to speciation” theory fails to explain why pigeons in Australia are the same as pigeons in New York City or London. It’s not like they’ve been flying across oceans to breed for the past million years...