Well I guess that settles it once and for all - in so far as the English courts are concerned the front-seat crew are merely drivers and are neither in responsible for nor in charge of an aeroplane in flight.
So from a purely legal standpoint passengers are entitled to ignore what they say and (if they should try to use force to bully or coerce passengers into doing things they don't wish to do) take any and all proportionate actions to defend themselves against unlawful abuse by the aircrew.
I can't see any other interpretation that could flow from this judgement.
PDR