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I'd recommend a decent admin. An admin who, having to leave password authentication enabled for whatever reason, fails to secure his machines with good passwords (which is what this bug exploits) isn't competent to administer such "mission critical" hardware.
Who cares what IP address the queries come from? We're not talking about anonymity here, we're talking about content filtering via DNS. What matters are the results that are returned to the client.
Distributed, hierarchical servers are the way DNS was designed and intended, so it actually is DNS. Trusting the hierarchy is another matter altogether.
So your point still stands. Do it yourself; it's educational and fun.