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I like to use the term “nickname” for what they call “edge names” in the article: a nickname is not as personal as a petname, it’s a name you share with others.
An interesting thing that the article sort of hints at is that these kinds of systems have a fairly smooth range of operating points between globally unique and centralized vs decentralized petnames. The article’s example of the bizdir local business directory is somewhere in between these extremes. It sort of turns Zooko’s triangle into more like a fan, where the “human friendly” point is fixed and there’s an arc describing the tradeoffs, from personal through local to global.
How can a petname system function at the global+centralized point, so it could replace the DNS? It needs to pass the “billboard test”: I type in a name I saw on a billboard and I get to the right place. (It might be a multipart name like a postal address or DNS name, with an extra “edge name” or two to provide enough disambiguating context.) I imagine that an operating system supplier might provide a few preconfigured petnames (well, it probably includes its own petname so the software can update itself securely), a lot like its preconfigured PKIX CA certificates. These petnames would refer to orgs like the “bizdir”, or Verisign, or Nominet, that act as nickname registries. Your collection of petnames is in effect your personal root zone, and the preconfigured petnames are in effect the default TLDs. There would inevitably be something like the CA/Browser forum to mediate between OS suppliers and nickname registries: a petname ICANN.
I wrote an older iteration of these ideas over a decade ago (https://dotat.at/@/2012-02-28-path-names-in-a-rootless-dns.h...). Those notes have a bit too much DNS braindamage, but I included some curious anti-DNS discussion: How you might make use of reaching names by multiple paths? What might it look like to have a shared context for names that is not global but is national or regional or local?