Actually if everyone in group already did MSQ and watched cut scenes already there is no point showing cut scene over and over. Only activate cut scene if there is a first timer in group.
Game at current state already boring enough forcing you to do things that you don't want to do for leveling (POD / MSQ etc.)
My suggestion: Make alternate leveling methods preferably enjoyable one people will abandon MSQ in no time. Turn MSQ into solo dungeon if people have to do it for quest, dungeon offers no challenge and no reason to get in with full party.