Speaking to the potential longevity of the show, I’ve always felt that one thing that makes shows (or movies) great, is knowing when/how to end it. There’s something to be said for telling a really solid story and having it conclude effectively without needlessly dragging it out and becoming a shell of itself. Most shows stay on way too long to milk it as much as possible, but cutting it at a logical point can make the product even better and all the more memorable. If done correctly, that is.