I think this breakup is at the stage that everything is a wound to both sides. Eventually things will sort out. But it sure is painful to watch this phase of the proceedings.
Like many of you, I think it's a bit exaggerated to say that Brian is trashing YuNa's reputation. Just complaining about her behavior in this instance is not the same as trashing her. In any case, even if he had such low motives, he couldn't do an iota of harm to her reputation. She's one of the greatest skaters ever and is an economic power all by herself in Korea. If she comes back and continues to skate competitively at her 2010 level, she'll still win most of the titles she tries for. (Whether she has the motivation to remain at that level is another issue.) If instead she decides to skate professionally, the sky's the limit. She could single-handedly boost the pro circuit in Asia, which is full of avid skating fans. She could tour in North America and Europe. (I doubt this current situation would drive fans away--she's far too exciting to watch. I'd certainly go!) She could do TV. She'll still do gobs of product endorsements in Korea. And she can sing! She'll be all right. Whether she can get another coach in Canada right now, I don't know enough to forecast. But she'll find a coach somewhere, if she wants one.
Brian will also do fine. He's a coach with an Olympic Gold Medalist, and it's largely due to his efforts, his strategic smarts, and his protectiveness of his skater. Frank Carroll waited decades to achieve that! Carol Heiss has never reached such a pinnacle. Neither have the Scotvolds, the fine coaches of Paul Wylie and Nancy Kerrigan. Brian can probably coach anyone he wants to.
Speaking of Carroll and Kwan: I think the big fuss at that time, as I recall, was not "he said, she said." No one said much of anything. The fuss sprang from sheer stupefaction on everyone's part (probably including Carroll) that a skater of Kwan's caliber, who was mere months away from a possible win at the Olympics, and who had trained under Carroll for her entire senior career, would suddenly turn away and attempt to coach herself. The one thing I remember from Carroll was a comment that if Kwan needed to ask him for any help or advice, he was available to her. I think they both behaved with complete courtesy, though it's still the one moment of Kwan's career that has me dumbfounded. There are some things we're just not meant to know or understand in this world.
I'm sorry things are unfolding like this, but I think the situation is a natural result of two things: the intensity of a coach-student relationship and the inevitable let-down after such an all-encompassing goal is achieved. It's as if the armature that held Kim up for her whole life now has no reason to exist. That would certainly make me a bundle of nerves! So I'm trying hard to cut both sides some slack.