This would make sense if there were several Disney Adventure parks in the same way that there are several Disneylands. Disneyland Paris is called that because there are several Disneylands, "Paris" serves a descriptor. Theres no need to call it Disney California Adventure in the same way DAK isn't Disney's Florida Animal Kingdom.
I think the name should be changed because halfway stepping in and out of the California theme stifles them. If they just want this to just be an IP theme park, we could've gotten Nomanisan Island from The Incredibles or Wakanda or Asgard from the MCU. Places from the properties Disney want to use that guests would actually want to visit. Them trying to stay "in theme" but still use IP is how we get an office park for Marvel, a carnival for Pixar, and potentially a hallway themed to Hollywood to leads you to an Avatar themed land. They know they want this to just be an Islands of Adventure type of park they need to just bite the bullet already.
I think a Disney theme park themed to California is totally doable even with IP and they were obvi on the right track in 2012 (if they tap in with me I have a couple of ideas
) but they clearly have no interest in that anymore and and should admit it.