I'm not a math guy either, so I can't really imagine WoT working just from within. Maybe as a recommendation tool for interesting npubs with similarities to you, but no idea how it will work for newly onboarded users. What would they see? How would they be seen? Would it make sense? 

I recently proposed NIP-85 https://github.com/nostr-protocol/nips/pull/1210 to create chains/networks of trust between NIP-05 providers. It is not based on calculated trust, but real consideration of compatibility.