This was a problem in 3 and 3.5 era too and was only exacerbated by the rise of forums and wikis. I don’t think it’s possible to release one-size-fits-all-the-crap-that’s-out-there campaigns that are going to be actually interesting. At some point the DMs job is to make decisions about what fits and what doesn’t, and to help cultivate a culture of collaborative storytelling.