Personally feels like that would be a step backwards. Take a brand new, amazingly immersive land and put in an attraction that is as you say 57 years old, regardless of whether you are using electric cars versus gas. Once RSR was built, you had the "Cars" or driving component and another set of Cars would have been a bit redundant IMO.
They have taken such a big step forward with this land that an Autopia Cars attraction would have truly diminished what they have created here. I can only imagine what the uproar would be if they would have transplanted a new version of Autopia into DCA versus all new attractions. It would be Carsmageddon.