Persistence hunting - is it really possible?

Here's an interesting post from John Hawks' blog about a magazine article about running, evolution (and hunting?) enthusiasts who try to see how hard it would be to track a pronghorn in New Mexico.
Apparently they failed. I'm still not convinced that this really debunks the theory that this type of hunting is possible or was important in our evolutionary history, but pretty cool to see people trying it...sounds like fun!