Well a deep thoughtful analysis is always good to be done as well as open discussion. But I don't see huge risk because relays already talk to each other. With DHT they will have another layer to talk to each other without using DNS.

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It is a completely valid and technically sound solution. Should be noted that there are ways to circumvent DNS without a DHT; FIPS + pubkey relays effectively offloads the discovery mechanism without touching the protocol.