Animatronics are incredibly expensive and we cannot expect every ride to cost $100,000,000. We would have very small parks, indeed (or very expensive tickets). This was not meant to be an E-Ticket ever, so it was given a modest budget and the Imagineers stretched that budget incredibly well to make a whole attraction with a reasonable story and a good deal of fun. They could have done what they did or, with the same money, had probably a few animatronics that guests would enjoy for about 20 seconds of the ride before returning to the old, dusty, run-down ride that they didn't have enough money to clean up b/c they spent so much money on their impressive flying-carpet animatronic. Given how this attraction is, any additional animatronics would likely have been of the calibre of a Fantasyland dark ride's animatronics--nothing awe-inspiring.