“The Flintstones” aired its 166th and last episode in 1966. “The Jetsons” ended after 77 shows in 1963. Will “The Simpsons,” closing in on 600 episodes, join the prime-time cartoon graveyard in 2019? Al Jean, “The Simpsons” executive producer, was asked this week if the iconic Fox show would continue past 30 years. “It’s quite […]