Well, if that just means the game becomes one long improv scene with all six players and the DM narrating a story about all their characters working together to solve some issue and go on some adventure--and not needing to roll any dice because the give-and-take between the DM and the players creates all the drama that everyone needs-- I'm perfectly good with that.“Tell me how awesome you are as you win” is the only rule you need.
I mean, to me that's what all roleplaying games are. Characters doing things-- sometimes successfully, and sometimes not, and then the drama of that moves the story forward. And whether that determination between possible success and potential failure is rolling a bunch of dice to see what happens or merely one the players choosing which one they want and the rest of the players 'Yes, And'ing it... the results are the same. Something works or doesn't work and the game continues.