Really though, this has always been the function of HBL/Hollywood Land. Monsters Inc has nothing to do with California, and neither did the Muppets, Frozen, Aladdin, Mad T Party, etc. The whole land is a slot to shove IP into that wouldn't fit elsewhere and has been since day 1.
I just can't get worked up about the theme integrity of DCA, because it has had very little since it was built. The park itself was built with a complete disregard for everything Disney had learned up to that point from building theme parks, for the most part passing the job off from real Imagineers to second rate cubicle jockeys with no experience. The result was a park that was embarrassing. DCA was embarrassing.