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Isaac Hayes is dead. Not that it’s the primary problem with your list.
Howzaboot Dave Thomas pertrayin’ da founder of Wendy’s, eh?
Geraldine Chaplin as Hannah Chaplin (her grandmother).
John Paul Jones of Led Zeppelin is getting a little long in the tooth to play the naval hero (though maybe stage names shouldn’t count).
Oh, we really need a Sinbad movie starring Sinbad.
Tangentially related, but The Right Stuff throws me off because it has Ed Harris as John Glenn, Scott Glenn as Alan Shepard, and Sam Shepard as Chuck Yeager
He lost out on fame by being left behind in the spaceship. Now he comes to free Ireland. He is… Michael Collins.
I would like to see Keith David and David Keith in a buddy comedy.
Bill Nighy as Bill Nye. For that matter, if the former gets called back to start in another Pirates of the Caribbean, and doesn’t want to, Davy Jones of the Monkees could step in. Sure he’s dead, but then the character is undead.
Oona Chaplin (Robb Stark’s wife) and her glorious rump as Oona (O’Neill) Chaplin.
Welsh singer Tom Jones could portray the romantic and chivalrous adventures of adopted bastard Tom Jones from the novel by Henry Fielding.
When they were younger I thought they should do a remake of The Defiant Ones.
If he was still alive, Robert “Jaws” Shaw could play conductor Robert “Chorale” Shaw.
A James Brown biopic, starring Jim Brown.
Reality TV host Jesse James could play the outlaw (who he claims was a relative).
Chris Columbus is mainly a producer/director but has a couple of bit roles as an actor and could play the navigator.
It would be amusing to see Jaye P. Morgan cast as the magnate J.P.
Harry Potter reported on Harry Potter.
Brian Cox (actor) could play astrophysicist heartthrob Brian Cox in his biopic, provided that it included scenes from his future life, when he’d really let himself go.
Madonna
Australian actor John Howard has played Australian Prime Minister John Howard, in The Games, giving the apology to the Stolen Generation that JH PM refused to give.
I’d like to see a movie filmed in Galicia, Spain, but set in medieval Galicia, the Eastern European region now variously part of Ukraine and Poland.
Unrelated fun fact: the main character in the terrible film “Troll” is named Harry Potter. The sequel, Troll 2, which features exactly zero trolls but some vegetarian goblins, is more popular.
How about a Stalin biopic which follows his upbringing in the ATL hip hop scene?
Also, on MAS*H Sherman Potter was played by Harry Morgan. (There must be an alternate universe somewhere where Rowling named her character Sherman Morgan.)
Female Welsh TV presenter Alex Jones could play male American radio nutbag, Alex Jones.
Even better, sort of, would be Oona Chaplin playing her grandmother Oona Chaplin. (Although she went by “Oona O’Neill”, the press still generally called her “Oona Chaplin”.)