Judging by Radiator Spring Racers where they used a next gen Test Track/Journey ride system and conveniently had the ride inside take place at night so they would not have to build expansive desert set, Indy today would have cost more than Radiator Spring Racer. That was what? 300 millions? Add a whole new ride system, the most expensive ride cars in the world, huge sets, pyro effects and what not... The sky is the limit and 300 millions will seem like pennies. When I spoke Tony Baxter, his words were something like "contrary to rumors, Indiana Jones Adventure at Disneyland came in on budget and on time at 85 millions".
Intamin, who copied the Disney EMV for two rides in Asia told me the reason why they only sold two: each of their EMV, which are not as smooth and well programmed as the original ones cost over a million dollars a piece. Can you imagine how much WDI would charge today for each EMV ride vehicle?
The best example I know of WDI waste: Toy Story Playland at Walt Disney Studios Paris. A custom Caterpillar spinning ride, a modified Half Pipe Coaster and a Junior Parachute tower from Intamin, add some cheap looking theming: 80 million euros. Six Flags would be ****ed off to pay 10 millions for the 3 rides at most and their theming efforts would be the same as what WDI came up with in that budget.
Edit: one last example: Ratatouille at WDS cost 150 million euros for the whole complex, including the ride, restaurant, a shop and a much needed addition to the park: high capacity restrooms.