Are others as persuaded as Mssrs. Melkar and Ryan by Ballester's
paper:
http://www.continuitas.com/ballester_equilibrium.pdf
that linguistic change was slower in the Paleolithic than since (or
elsewhere)?
It seems the sort of speculation that can't be proved or refuted.
My reaction is just a shrug.
By the way, I've read the late Grover Krantz's book on development
of European languages, which Ballester quotes with approval. I've
also read his book on Sasquatch, the Abominable Snowman's cousin in
the NW USA. Let's say Krantz was never one to let flimsy evidence
stand in the way of a good story.
Dan Milton