Internet routing gets strange if you decouple BGP relationships from physical links on a large scale. I just don't see NANOG going for it.
You don't "decouple BGP relationships from physical links on a large scale" you'd use namecoin/something like namecoin to establish ownership of address space / ASNs. E.g. RPKI (https://www.arin.net/resources/rpki.html
) but with a decentarlized blockchain in the place of ARIN.
I suppose it would work fine— but why. The centralized systems work okay for these things, and it's not like decentralizing ownership of the identifiers is enough to accomplish much (no one attacks ISPs by attacking their ownership of address space or ASNs).
Namecoin is interesting largely because the current domain name system is dysfunctional, often even failing to provide the fair protection of reasonable lawful process to its users.