How Does The Show Change After Losing Its Original Lead Characters?

[kangroo]

Long-running shows sometimes continue successfully after major characters disappear. "The Walking Dead" became a useful example of this, with several central figures eventually leaving the story. Does replacing familiar characters keep a franchise alive, or does it gradually turn the original series into something else?

[Nomad]

Just like life, shows also have their own life and they continue to evolve, it does not matter when important characters disappear as long as the story is still interesting and new characters are introduced frequently.