Keith,
even the DNS names for major services may not be well maintained.
at one time I did a survey of the reasons for mail bounces
for one of my larger mailing lists.
You appear to be saying that because historically people screwed up
configuring their DNS that it is impossible to rely on the DNS for critical
infrastructure. This seems wrong to me.
If a properly configured DNS was a fundamental requirement of a working
network connection as is assumed by something like 8+8, I think it fairly
certain that any misconfigurations would be fixed as quickly as (say) a BGP
misconfiguration.
Rgds,
-drc