(stupid overused .gif of Citizen Kane applauding)
That's the main issue here, that the real park designers have to focus on long after fan-fads have faded:
Disney Parks is not the Disney Movie Hall of Fame, where a movie's success is rewarded with a gradiated amount of customized Imagineer work in tribute, it's an amusement park--It's a place you want to go to when you want to pretend to be somewhere else.
Cars and Avatar have shifted the fanboy mantra from "Dark riiiiiide!" to "New laaaaand!", but we've lost sight of why Radiator Springs happened in the first place: They'd tried to bring Test Track to the west coast since the days of Rocket Rods, but when Lightning took up NASCAR racing, and the movie caught on....Duh. Of course.
Imagineers had a little fun creating the embellishment to surround it, but every land is still a story in itself, and I'm sure there are plenty of Cars 2 haters who also don't get the idea either and say "Why did Disney need to immortalize Cars, it wasn't that great, was it?" Well, maybe that wasn't the central idea either. Lightning winning a rally wasn't the central crisis of the Cars universe, it was just being in that odd little alternate place.
Let-It-Goers (or whatever's the dismissive nickname for Frozen fangrrls more obsessed with being in love with the movie than the movie itself) are disappointed that "all Frozen got" was characters, but really....what else did you remember the movie FOR? (And don't freakin' say "The song".)