if you are using ''repercussions'' in a negative way then technically no....however a repercussion does not have to be negative...it just usually is....
i don't see why any ingredient is really "necessary." besides words, of course. some ingredients certainly make a story better, but that doesn't mean they're required.
I can think of one feature film that has no repercussions, but no others. Even realism films like Family Life (1972) and Walkabout each have at least one repercussion in them.
