Disclaimer: I'm a big fan of the books.
I'm sure an attraction could be made from the movie. Heck, country line dancing got it's own attraction, and that was popular for what, five minutes in the mid 90's?
The attraction could start with Arthur being captured by the Vogons and teleported to some sort of intergalactic prison. Something goes wrong with the teleportation, and Arthur escapes. Hilarity ensues as guests hear Arthur running all around them (via surround sound), trying to avoid capture, while the voices of Vogon guards shout all around them. At some point, Arthur's stomach gets the best of him, he burps, and guests are treated to the smell of the beer and peanuts he consumed prior to teleportation.
With much difficulty, Arthur is re-captured. Before he can cause further trouble, he's teleported from the prison to a replica of the Earth, resplendent with it's own copy of the Magic Kingdom's Astro Orbiter attraction. In-the-know guests are left to ponder the irony that some people consider the theme park a prison. Everyone exits through a gift shop, where you can purchase plush in every possible character and size. Anyway, that's how I see that attraction shaping up.
On a serious note, there's also potential for the Restaurant at the End of the Universe to turn into a sit-down Tomorrowland facility, something lacking on that side of the park. Think of the entertainment.
Len