The bottom line is, as many have said: RSR just doesn’t fit in Magic Kingdom. At least Coco does. The “fantasy” of Cars isn’t the same as everything else there. And as some have said, the credibility of this whole rumor isn’t that solid.
Even TRON fits the futuristic, science-fiction theme of Tomorrowland. Even with Galaxy’s Edge at Disneyland, at least Star Wars does well with combining fantasy and sci-fi. If the overall opinion is those don’t fit, then those should be the only ones that don’t. No more. I myself don’t like the transition from Fantasyland to Tomorrowland, but most of that is fixable if they decide to do something with Speedway.
Furthermore, they never put Cars Land in Disneyland where GE is, and that was before the latter. Paris only has Cars stuff in Studios (later DAW). They could’ve put something Cars where Geyser Mountain would’ve been. But they didn’t. This “modern car culture” has more of a DHS vibe than MK.
People can keep defending this idea if they so please, but I know of a certain entertainment channel known for themed entertainment critiques who most likely won’t….