Why is it only a net gain if they share the text? A single tribe being more aware of the truth is still more than zero
Still, it's a good point, although the same can be applied to the Chantry: the Academic Notes end in wondering if perhaps the story could be publishable, nothing else.
More than zero, but less than if the Chantry publishes it. Net gain is compared to alternatives, after all.
The Academic Notes don't really cast doubt on the Chantry spreading the truth- merely that it might be accompanied by biased analysis. Not only is this hardly unique to the chantry (see- Dalish equivocation of guilt), but it's far more publication than... whatever the Dalish will supposedly do.
Given that, contrary to the issue about Ameridan, the ending of this quest isn't adressed in the DA Keep (correct me if I'm mistaken), I guess it won't matter. If given to the Chantry, the book will never be published, and if given to the Dalish, the whole clan will die as per Bioware tradition. If the halla was sent, someone will eat it. Only a copy will be kept in a former Inquisition library until a historian finds it centuries later. By that time it will be a historical curiosity and no one will care too much.
Or something like that.
Don't forget the third option.
C: Numerous Dalish won't accept it.
Either because they don't hear about it because of fragmentation, don't believe it because of ideology, or don't understand it because hard copies aren't passed around.