There have been assorted things done. The ride vehicles were supposedly sold to some kind of park in Mexico, although I thought I had heard that they never ended up being used. You can see one or two of the flying car type props on the tram tour at Disney Studios Paris. Another prop has been painted and used as decor at the Backlot Express restaurant at our own Disney/MGM Studios. And, as always, the MouseSurplus warehouse somehow gets their hands on various props and portions of show scenes and sells them to the general public. They just sold a portion of the neon-50s future part of the Looking Back at Tomorrow segment a few months ago for about $200, if I remember right.