Would the fire have been 'fightable' if cabin crew had been asked to come to the flight deck and deal with it?
Very difficult to say since the fire started behind the panels to the rear of the FO and progressed into the ceiling. It only became exposed and 'fightable' once it had burned through by which time it would be beyond the capabilities of the fire extinguishers supplied.
As a pilot, would you ask a CC member to rip out electrical panels to access a fire of unknown (at the time) magnitude and potential?
I think it is fair to say that until this accident, it was widely assumed that fire retardent materials and regulations would not allow a fire to start and progress so quickly causing so much damage to systems.