I believe a show should only run as long as its story warrants it for. Some shows can go however long it wants because it creates its own stories on the go like Doctor Who or Star Trek so they’re going to have many series and seasons. But shows like Dexter that start going off its hinges and falls apart because of it going for too long because it had no direction and its story could already be pin-pointed as to when it ends. Those kinds of shows shouldn’t be going on at any rate.
If you don’t have the creative prowess to keep a show going, tell its story and be done with it.
I believe a show should only run as long as its story warrants it for. Some shows can go however long it wants because it creates its own stories on the go like Doctor Who or Star Trek so they’re going to have many series and seasons. But shows like Dexter that start going off its hinges and falls apart because of it going for too long because it had no direction and its story could already be pin-pointed as to when it ends. Those kinds of shows shouldn’t be going on at any rate.
If you don’t have the creative prowess to keep a show going, tell its story and be done with it.
Like “Longmire,” or “The Mentalist.”
The bad guy was gone, what else was left? End the show on that.