Phaige,
From conversations I've had with him, I believe Mr Donlon has become very wary of encouraging others in a pursuit of a phenomenon that he believes is at best deceptive, and at worst, intentionally malicious. He has said that since he isn't sure of the true nature or intentions of the bigfoot 'problem', he is uncomfortable letting it continue to have a prominent place in his life.
I totally respect his decision, but his insights into the phenomenon are missed. Even when I disagreed with him on some point, he always made me think. I also appreciate that he readily admits that he doesn't have any definitive answers, just reasoned theories to share.
The "giant ape" paradigm is crumbling, and that terrifies many of the old-school scientific materialists who refuse to see anything but a gigantopithecus or other "living fossil". Some other bigfooters are too comfortable in "mainstream" bigfootery to risk being bumped to the the fringes by admitting that they are aware of the dreaded "woo" factor.