It’s pretty clearly already a red line, it was mentioned as such in Josh’s May post,
reiterated with underlining in the guidance post,
“the total supply of ZEC would continue to never exceed 21 million” Zcash Foundation Guidance on Dev Fund Proposals - zcash foundation
and multiple foundation members have already made it clear they consider it a matter of personal necessity to uphold. So… this aspect of the social promise is pretty clearly alive and well. I’m symbolically downvoting it by not pounding the 
despite the post being well written and having useful arguments in it.