I have been hiking up there. I would say the ginseng is abundant there. I ran into a giant copperhead last time I went hiking there. BTW, that is one of the most beautiful well shot videos I've ever seen. Fantastic job shooting and editing it.
That gorge is dangerous man. I have been in and out of that gorge since I was a kid. Check your ginseng map because there are areas that are national forest that you can't dig ginseng in just like Cowetta. As far as the Gorge goes I have broke bones, seen people break bones, and have seen a couple of people about die there. Weather, unstable ground, Sharp Rocks, unpredictable water, and others factors.