I like the idea of clients automatically subscribing to the relays listed in the notes of the npubs they follow, I can see how this could allow for a more decentralized mesh of relays than there is now.

The problem is that it would be a clusterfuck of bandwidth usage if based on the NIP-01 protocol, but seems like it might be workable with client-relay adoption of strfry's #negentropy set reconciliation algorithm. Exciting times.