There has been quite a bit of debate within EOS community regarding whether the ECAF decisions should be followed by BPs. I know of at least one Voter Proxy who has stated that he will not be voting for any BPs who follow ECAF decisions, and some BPs have stated that they will not follow ECAF decisions. It's complicated because there isn't a good referendum tool for users to vote on articles in the constitution (yet, but there are solutions almost ready to be deployed). So, I can't summarize all the discussion that has happened regarding this topic, but Mr. Grigg's post is not just an academic exercise. To me, there's a significant challenge to the concept of a blockchain constitution that is being debated within EOS right now.