>>5,6I don't see a point in using a much slower internet unless you live in a third-world dictatorsip(and even then it probably puts you on their secret police crosshairs).
Normies won't join tor/i2p/freenet without major incentives(besides drugs), and without the masses of people its neither very anonymous nor capable of producing much content. Its a niche system for niche uses. It also probably won't scale to handle a Reddit-level site and youtube will be technically impossible.