Well, with ENUM you can still have those two numbers, each referring to their own set of services. One for home use and one for work. Where's the problem?

leto, I believe the author of PowerDNS, among other people, was acutely aware of such interoperability issues and has been endlessly advocating source port randomization and related measures. It took a Kaminsky to make the DNS world - too busy with DNSSEC as the "Endloesung" - to finally turn an eye towards reality again, and rush out a measure that was already implemented years and years ago by DJB and had been in an IETF draft for about 2 years. And you dare to write this? Wow!