I tried to push for more practical approach to playing without a single player, but both in my D&D and in my Blades in the Dark groups, players just feel...uncomfortable with the idea and don't want to play if all players aren't there. I once proposed a system where we could play in smaller groups to accomodate one player's schedule not matching others...and upon realizing they wouldn't be playing in full squad in this sytem, that player just quit the campaign.