Haha, ok, let me amend what I said previously: SOME AUs are alright. I like "what if's" if they are just alternate endings of certain episodes, or amnesia fics (like the one you described), as long as they eventually RETURN to canon. I've even read a few "so-and-so is deaf" fics that I've enjoyed.
The AUs that I don't like are the ones that change the premise entirely: Mary lived, John died; the boys grew up separately and/or never knew about hunting; the boys aren't related (usually this is just an excuse for non-incestuous sexy-times); they were raised evil...etc.
AUs that explore the canon and the characters AS THEY ARE ON THE SHOW are fine. AUs that change things so dramatically that the boys don't even have the same personalities - not so fine. I don't even like explorations of the canon occurrences of premise AUs (WIAWSNB and It's a Terrible Life).
So, yeah, I mean, there's leeway in my no-AU rule, but only as long as the show eventually either returns to canon, or the ending is open enough that you can imagine it returned to canon.
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The AUs that I don't like are the ones that change the premise entirely: Mary lived, John died; the boys grew up separately and/or never knew about hunting; the boys aren't related (usually this is just an excuse for non-incestuous sexy-times); they were raised evil...etc.
AUs that explore the canon and the characters AS THEY ARE ON THE SHOW are fine. AUs that change things so dramatically that the boys don't even have the same personalities - not so fine. I don't even like explorations of the canon occurrences of premise AUs (WIAWSNB and It's a Terrible Life).
So, yeah, I mean, there's leeway in my no-AU rule, but only as long as the show eventually either returns to canon, or the ending is open enough that you can imagine it returned to canon.