If life were predictable, it would cease to be life, and be without flavor. — Eleanor Roosevelt (1884-1962)
If prime time drama were predictable, it would cease to be on prime time, and be without flavor. - exskindiver
Predictable: Able to be foretold
Dependable: That can be relied upon; reliable.
If the main character in Grey's Anatomy lives, that might be considered predictable.
If she dies, that might be called dependable entertainment.
Dependable-- because people enjoy being entertained by a modicum of love, humor and drama and unpredictable events as long as it is on tv.