I liked Park Lore's article about this sort of thing, where they explain how Disney parks are all just slowly losing their individual identities and becoming "Brand Loyalty Centers" over time. -and about how Imagineers are no longer "creators" of content, they are now "curators" of it, doing their absolute best to try and make whatever popular, previously established, mandated IP is handed down to them "fit" within any given park as best they possibly can.
There was a point in time (around DCA 2.0) where those calling these shots would have asked themselves, "How does this fit thematically within a place like DCA or celebrate the richness and diversity of California, its land, its people and its stories?"
Nowadays, though, the only real question is: Did it make money and is it owned by us? Yeah? Then toss it in someplace. Avatar in DCA? Marvel for Epcot? Star Wars land for Disneyland? Cars in Frontierland? Sounds good. No one will notice or care, it's all Disney to our consumers. Why on Earth would these parks need identities that make them special or unique from one another when you can just have Disney/Pixar/Marvel/Lucasfilm/Fox Park #1 and Disney/Pixar/Marvel/Lucasfilm/Fox Park #2?
Ranting aside, if they care at all about the last bit of identity that DCA is holding on to, they will do their best to create some kind of transition from Hollywoodland to Avatar, where perhaps it feels like Guests are stepping onto a movie set that starts to come to life around them.
But that will sadly never happen.