I'm guessing they'll run into the 'Chinese store' problem (though I forget the exact name of the scenario).
If one does something that's successful, another copies it, to similar success, and before long everyone copies it and dilutes the success to such an extent that none are no longer successful.
It's called such because it's a noted phenomenon in Chinese communities - to the point that you'd have two of the same type of store directly next to each other.
likewise, we need to remember that the other dungeons were all copying each others methods to attract humans, because they had no understanding of human wants - so they'll likely just copy this dungeon exactly.