Correct me if I'm wrong, but I2P doesn't seem to fill the void. I think what is missing from that is the "norm" of the old internet. The internet was a playground with tons of hobby projects and experiments in its earlier days. I don't see TOR, I2P, etc, building the same playground because the novelty and ease of access can't be replicated.

It can be its own thing, and help alleviate the pressure of the contemporary internet, and that's fine. But it won't be what fixes the issue of dead internet or commercialization, or whatever we want to call it. That'll take systemic change.