Re: Why do teachers stop learning?
One of my instructors, a fourth dan, has been working with me a lot lately on kokyu dosa. If my entry is not correct, she will mysteriously turn into a boulder which I can't move. It's a compliment, I guess--I'm improving so she makes it more difficult.
It was fascinating to see her at a recent seminar practicing kokyu dosa with the seminar instructor, a look of intense concentration on her face--because if she didn't get the entry correct (on a level I can't begin to appreciate yet) he was turning into a boulder and she wasn't moving him. A lot of the junior people silently stopped training to watch, because it was fascinating to see one of our very best challenged that way.
It's far from inevitable that teachers stop learning.