WGTC writes: TV in general has gotten tremendously more daring, and that means that an attention-grabbing premise is no longer enough. Networks need to give viewers a reason to keep coming back after the novelty of the premise has worn off. For broadcast networks, that has meant keeping shows spinning their wheels for as long as possible. Thus the case-of-the-week format of crime shows where every story is self-contained and there is rarely any forward momentum to a show’s overall narrative. Forward momentum means moving towards an eventual endpoint, and networks don’t want that. They want viewers coming back week after week out of sheer, lazy habit.