We will shortly be providing a "list of number resources with no valid POC" for those who desire it (per the current bulk Whois policy.)
If you can put an annotation into a whois records for a POC, saying explicity that you can't get ahold of this person, then it would seem to me to be a rather trivial matter of programming to
transplant
a very similar sort of annotation into each and every IP block or AS record that has that same specific POC record as one of its associated POC records, either Admin, or Technical, or whatever.
Also a nice idea, and one that I've taken as a formal suggestion for improvement.
Those two things would be enough for me for the numbers covered by agreement, the legacy issue is a tougher nut. There should be some sort of requirement that any network being announced have a valid point of contact. Whose jurisdiction that would fall under for a global Internet beats me.