The Carousel of Progress is in the top of my family's "Must See List" at the Magic Kingdom.
In the final scene of the show, over on the right hand side, up on the corkboard, there is a post-it note with the quote, "Marty called - He wants changes!"
Now, obvously, this post-it note is a nod to the show's co-writer and Imagineer Marty Sklar. Sad to say, however I have been learning recently that some large changes to the CoP are under consideration. WDI is seriously considering creating a new attraction in the Carousel building at Magic Kingdom involving the Little Green Men from Toy Story offering guests "Flying Saucer Lessions". This would be kind of a retread of an old Disneyland attraction called the "Flying Saucers", which closed in 1966. As far as I know, this has been in the works for the Carousel building for a few years now, and WDW is looking at 2008 as the year to open the new attraction.
The official word from Disney is that there is no plans to close the Carousel of Progress. If, however WDW does close the Carousel of Progress, that will be one less reason for me to visit.