is not about buying or sinking yachts, its about a bunch of friendly barflies. We could have seen the yacht sink, but what does that have to do with the story?
TV violates the nothing-important-offscreen rule when it has to. Sometimes you have to get rid of an actor because they’re difficult or talentless or the audience just hates them. Unless the actor is willing or contractually obliged to participate in his character’s demise, you may have to do this offscreen. The show may not have any produceable way to show the change. Your actor may actually die; all you can do onscreen is have a closed casket and a wake, if you’re willing to deal with the consequences.