Yes, it would completely be an informal and un-enforceable 'consensus'. More of a way to unify those in the community who want ongoing upgrades and those who want a protocol freeze.
Maybe celebrate August 1 as "Fork Day", requiring any "Hard Fork" to only occur on that day. Turn it into a party - no Devs bathing or dining until exchanges let BCH trade again.
Agree to only 5 [or other arbitrary number] more hard forks *ever*. Leave open when or what they specifically are. This ensures they are not used trivially. Each one that is used makes