Escapee: Will ‘ER’ End Well?

Escapee: I have never watched it. But I’ve had my favorite shows end. … NYPD Blue had a much-celebrated ending. I wonder how many more seasons CSI: Miami will last. I ‘spose as long as Horatio can lift a set of sunglasses to his face, I guess …

Question: Which long-running TV series had the best ending?