Limit the number of sequels a movie can have. 

Limit the number of seasons and episodes a TV show can have.

Make a max age limit for touring musicians. 

I suggest 3 sequels max for a movie. 4 movies is enough to tell a story.

I suggest 3 seasons or 40 episodes max for shows. 

I suggest when a musician turns 60 years old, their touring career is over.

They can still make albums and do occasional shows, But not tour.