[dns-operations] can UDP really be used for anything in "today's Internet?"

[Rick Jones]

With all this talk about spoofing source IPs on DNS queries, open 
relays, amplification and the lack of incentive for BCP38 and such I 
have to wonder - can UDP, with its lack of a "handshake" really be 
used/trusted for anything on "today's Internet?"

And if so, what implications does that have for DNS?

rick jones