It was always a stupid theory.
It is a stupid theory.
Humans had almost zero impact on the buffalo until the arrival of two things:
The horse and the gun.
To think that stone-age humans could have decimated the mammoth population is ridiculous. An individual mammoth is just too large and powerful, human hunter time could have been way more effective against smaller prey.
http://www.amazon.com/Red-Earth-White-Lies-Scientific/dp/1555913881