Ack! There goes one of my dreams. I'm looking at writing screenplays once I'm out of college, and while I'm not a fan of writing biopics, I was honestly considering writing one for Jim Henson. I guess the world just beat me to it.
Don't let it stop you. You could very well write a GOOD one!
If you read the script, or even a good review of it, then you'll realise exactly why it isn't happening. The thing is a complete misrepresentation of Jim's life.
To elaborate, the only info added into the film was taken from bits of wikipedia (and doubtful it was Muppet Wiki), and generic biopic nonsense polluted the project. Over all, I get out of it wasn't that Jim should have been a bigger hit than what he was, but that Jim was a failure, even when he had a success on his hands. And a dismal atmosphere permeated the entire project rife with dark, unfunny, depressing cutscenes that look like Robot Chicken sketches written to be dramatic. If he was going with comedy with a diabetic Fozzie and a morbidly depressed Kermit living in a flophouse, then that guy has some borderline disturbing thoughts of what's humorous. Not that I can't appreciate dark comedy, but there's a difference. Dark comedy is STILL supposed to be comedic. Charlie Brown getting frustrated and kicking Lucy's head off? Dark Comedy. Charlie Brown ending it all? That's just dark.
And the worst part is the writer is defending the project, saying something to the extent of , OH! It's like Being John Malkovich! It's supposed to be like Being John Malkovich. No, it's ugly depressing Oscar bait, because we all know the only intellectual artistic feeling to feel is constant depression and misery.