Zemeckis is dead-on

Director Robert Zemeckis capturing the current cinematic zeitgeist when asked by /Film why there won't be a sequel or reboot to his beloved "Back to the Future" and "Who Framed Roger Rabbit"

"Most sequels, you’re behind the eight-ball on them. When audiences clamor for a sequel, what they’re really doing is expressing their enthusiasm for the movie they just saw. And that means they’ll have a love-hate relationship with whatever comes next, because they want it to be the same movie, but different. If it’s too similar, they don’t like it. And if it’s too different, they really don’t like it. There’s nothing more difficult."