Who cares if it works in places that won't play nice? They're digging their own grave if they don't publish, and only hurting themselves. The nice thing about massively distributed systems is that they can be as reliable as the people who depend on them need them to be, with the relevant authorities having the option to be as real or as clowny as they want to be.

That said, I would never respect the DNS TTL of such a scheme, for my own use cases. I'd query each of them once an hour, latch the last response forever, and delay propagation of a new response for a full week that it stayed stable before serving the new record.