3. Tribal Schisms and "The Great Migration"
As the forum population exceeds Dunbar’s Number (the cognitive limit of 150 stable social relationships), the sense of a unified "community" will collapse.
* The Prediction: Sub-forums (e.g., the "RPG Maker" section or the "Off-Topic" lounge) will develop their own unique dialects, inside jokes, and moral codes that are incompatible with the main board.
* Social Result: This will lead to Sectarianism. Eventually, a charismatic "Power User" will get banned by an "Elite" Moderator. This "martyrdom" will trigger a mass exodus—a "Great Migration"—where a specific clique leaves to start their own, smaller, "purer" forum. The original board becomes a "hollowed-out" empire: large in numbers, but low in social cohesion.