> This as a community project defeats the purpose of creating a definitive grammar/spec that protocolbuffers/protobuf holds itself to - without that component, having a community-written spec is no improvement over the current situation from what I can see, and in fact could create even more fragmentation and confusion, just my two cents.

It looks like the protobuf team created a repo intended for this (https://github.com/protocolbuffers/protobuf-grammar), perhaps the spec could be contributed there, including a review/blessing from the official team.