I'd argue that Autopia should stay BECAUSE of the intangible stuff. It is a GREAT ride for those under the age of 16 (and their parents), fitting in the spirit of Walt's original idea of a ride that family's can enjoy together. Like
@cmwade77 said, it just needs to be updated to make it reflect a vision of cars in the future.
Here's my Blue Sky idea: I'd love to see electric cars on a solar-powered charging highway. The cars keep an engine sound. Hey, what if the driver gets to decide WHICH car sound it makes? (Push 1 for gas-powered lawn mower, Push 2 for muscle car, Push 3 diesel, etc..)