Obviously, there are the plot points that were deleted or unused concepts (like Starboy) and that would have made it work a lot better. But that's a reply for the Wish topic. My proposal is a simple what-could-have-been as a way of honoring TWDC on their centennial.
Why not do an animated, semifictional biopic of Walt Disney's life and the founding of the studio itself? You could even use the same 3D-as-2D Paperman style used in Wish to emulate that hand-drawn feeling that would be perfect for this! I'm by no means a professional screenwriter/songwriter/etc, but I figured I'd take a crack at it, because what else am I going to do on my day off?
The film could open showing Walt and Roy as young paperboys in Kansas City, running their father's route on a cold, snowy day. Walt, ever the dreamer, gets distracted by something - an art set - in a shop window. The camera has Walt in the background, staring at the wares in the window, while Roy is in the foreground and rolling his eyes as he turns around. It's then that we get our first song of the movie, a duet called 'Possibilities'. Roy sings about the possibilities of their new life in Kansas City, while Walt sings about the possibilities beyond that. It's made clear that Roy is a realist and Walt is the dreamer between the two. While this does not function as Walt's 'I Want' song, there are seeds of doubt that are already planted in the young boy's mind.
The duet ends with Walt (at least temporarily) brought down to Earth by Roy's urging. As he tries to get his mind off of what he just saw, he whistles a few bars of 'Turkey in the Straw' - the same bars used in the current WDAS logo - as they walk down the main sidewalk. The sky pans up to show light snowfall, and then the film's title, Dream, with the logo stylized in Walt's handwriting.
After the film's logo, we see Walt in school with his classmate Walter Pfeiffer, who introduces him to the world of motion pictures. We see ten-year-old Walt's eyes aglow, livened up by the possibilities. It's here we get our first reprise of 'Possibilities', this time a solo that is longer and does function as Walt's 'I Want' song. Walt tells Walter about the art set he saw in the shop window, and Walter urges him to buy it. That day after school, Walt does, and arrives home to practice his art before it's time to run the evening route for the newspaper. In a nod to Mulan, once Walt runs out of scrap paper, we see that he has taken to doodling on his arm.
Elias enters Walt's bedroom, finding the youngster on the floor and staring off into space. Elias urges him to get up and run the evening edition, and pulls the boy up by his arm (exposing the drawings Walt was doing). It's here where we get a song by Elias in the vein of 'The World Above (reprise)' from The Little Mermaid on Broadway's original run. Walt is reminded to stick to his current surroundings and place in life.
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This is actually as far as I've got