Okay so, I immediately like the idea of a hive mind community… that incorporates others. I think that is cool. Like, not full on hivemind, but a subconscious sharing of ideas. I imagine that if everyone's thoughts can be perceived by everyone, you slowly homogenize and become the same. It would be really cool to see people brush up against this experience. I think there is a lot of story potential there.
I mean, imagine this as well:
Imagine if people hadn't gotten solid evidence on these guys, but because they have a wide area of effect, people experience a weird "disassociating" in certain, say, mountain passes. You can then record the confused brief "merging of consciousnesses" by unwilling patrons from across the eras, combined with some "invading thoughts" of wild, strange looking men. You could (as it seems you have already planned) link these experiences to the cultural archetype of "wild men".
But, what I'm not seeing is the connection between the themes of "wild men" and such a communicative anomaly. I think you're gonna have to pull off some fun, innovative concept melding. Perhaps something a bit more conceptual than the anomaly having evolved as a purely communicative measure on the part of the "wild men".
Also, though this might be personal taste, I think this story might be better told without ever actually talking to the "wild men". Keeping them mysterious and otherly might add an air of, ehh, well I guess the word is mystique but it feels awkward to use mystique and mysterious in the same sentence. It would be nice if maybe the final addendum had maybe the first real confirmed sighting of them, but it wasn't by the Foundation, and no communication was established. I think that, if you played your cards right, that could be a very intriguing ending. But I can only see an interview with them playing like straight exposition, and I don't think we want straight exposition.
I don't have a closer for this… I think it'll be interesting to play with the idea of "cultural zeitgeist" and those ideas that somehow persist between cultures (like how almost every culture has a form of dragon) through the lens of a literal shared consciousness. Like, play with the metaphor by making it a reality. That, my good sir or madam or neither or both, sounds like a really fun article.