My main gripe with all of this is the Cars IP.
In my opinion, everything in Magic Kingdom should be whimsical (fun, not too serious), and removed from the modern real world. So I don’t think Star Wars or Marvel fit, as they are too serious, real-world, and/or political.
Cars is fairly whimsical, but it’s essentially set in a version of the modern real world. I really love the first Cars film, and the land in California looks great, it would just be better to have it in Hollywood Studios.
If it were a more suitable property, I’d be much more in favour. For example, it could be a Pocahontas themed river rapids.