Hm. I am in firm agreement re: importance of re-discovering your own language. And I do like your idea of bringing together the German speaking LJ-based fans. I have no idea how you'd reach out to them, though, because I guess the whole point of this is that they wouldn't be in any of the German fandom communities. I know I'm not.
But I also just realised, and I think this may be the crux of the problem, that there aren't many media fandoms where it would make more sense (i.e. in some way improve the story/'verse) to write in German rather than in English. I mean. What's the point of making characters in a castle in Scotland or characters roadtripping through the USA speak German? You're just losing part of their personality that way. So I'm not sure what the draw would be for people who are perfectly comfortable writing/reading in English. (Because I don't think that "using German for the sake of using German" is enough of a motivation for most people to lose 99% of their readership.)
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But I also just realised, and I think this may be the crux of the problem, that there aren't many media fandoms where it would make more sense (i.e. in some way improve the story/'verse) to write in German rather than in English. I mean. What's the point of making characters in a castle in Scotland or characters roadtripping through the USA speak German? You're just losing part of their personality that way. So I'm not sure what the draw would be for people who are perfectly comfortable writing/reading in English. (Because I don't think that "using German for the sake of using German" is enough of a motivation for most people to lose 99% of their readership.)