Unfortunately, after four years, I cannot see them making any adjustments to Castrum and Praetorium. The devs acknowledged their mistake and have seen only played cut scenes once you exit the duty. There isn't much they can do short of revamping the entire dungeons into a single trial. If they force people to watch cut scenes, veterans will never queue for it. At this point, adding a warning would at least brace unsuspecting new players about the DF and to try forming a party if they wish to want scenes as they unfold.