I never had enough musical talent to be able to imitate Doc Watson to any extent, but I've always admired his ability. Here's
another video in which he explains how to play "Deep River Blues" fingerpicking style in a way that makes it seem approachable. (With an extra finger or two you'd think you wouldn't have to be as fast as when he plays with a flat pick. That's often the way I feel
before I try something.)
Hope he pulls through.