*Nods* I've heard people say that's the reason fan fic exists in the first place - to fix all things wrong in canon. ;D I think there may be a few other reason, too. But I'm good with this explanation. And I can absolutely see a surge of interest in the pairing after the release of the movie.
I'm also one of those people who think that if fandoms which haven't been energized by new additions to canon/re-releases in decades can still flourish, there's no reason anything as classic as Snarry has to ever disappear.
As for the Games, well, it's like Smutmas. Unless someone can talk the original organizers into re-starting them, fandom just has to make do with other fests.