Sam Lessin: Web 3.0 is — at the most abstract level — really about right-sizing communities to a scale people can have a sense of personal purpose and place. It is about giving people ownership in meaningful way in the context of the people they want to be with and impressively extending that experience.
Success here will come down to implementation details. The incentive structure, funding sources, size, goals, moderation approach, and community management philosophy of these networks will determine their long term viability as both businesses and communities.