Honestly, Gaiman's "GRRM is not your bitch" essay always ignored the wider repercussions of very famous authors being unable or unwilling to finish an ongoing series. Not in ANY way do I suggest that fans abusing an author is ok. It 100% is not. Even just reaching out to express criticism directly to someone who is, in fact, a stranger is fairly questionable.
But in addition to publishers being hurt when a series can't or won't be finished, the industry as a whole feels it when there are prominent examples. It's certainly possible to chase away fans of the genre as a whole. Personally, I've stopped reading first books that are promoted as being part of a fantasy series unless the writer has already demonstrated they can complete a multi book storyline. And I used to buy those ALL the time. Now? Nope, I'll wait till you're finished. And that's directly because of Martin and Rothfuss.
I'm sure they always had the best intentions. But when you let down people you're working with and people who were paying for your books, a little public criticism is still justified regardless of intentions.
But in addition to publishers being hurt when a series can't or won't be finished, the industry as a whole feels it when there are prominent examples. It's certainly possible to chase away fans of the genre as a whole. Personally, I've stopped reading first books that are promoted as being part of a fantasy series unless the writer has already demonstrated they can complete a multi book storyline. And I used to buy those ALL the time. Now? Nope, I'll wait till you're finished. And that's directly because of Martin and Rothfuss.
I'm sure they always had the best intentions. But when you let down people you're working with and people who were paying for your books, a little public criticism is still justified regardless of intentions.