While I personally would love to see an animated presence in every park, I sadly agree that AK and DHS are probably the parks least likely to get animated additions in the future. In my very humble opinion, it seems like MK and eventually EPCOT will be the place to go to see animated characters while AK will take a more realistic view of the world and DHS will be Star Wars and some pixar (so I guess some animated there). For me, when I go to a Disney park, I enjoy seeing Disney animated characters and movies. I don't see it as out of theme (I'm in a Disney theme park for crying out loud) but to many Disney is more than animated hits and I get that too. Back on topic, this is why I think Rivers of Light, will be filled with clips from Disney nature and not footage from Pocahontas, Brother Bear, and Nemo.
PS- I know many claim that the lines of the parks are being blurred and that "animated movies belong in MK" but I think from a business standpoint it is smart for each park to have a healthy presence: rides for little kids, rides that are more thrilling for teens and adults, animated characters and movies, rides not tied to an intellectual properties, etc. You will get less guests saying "oh that park does not have any fun animated characters, let's skip AK" or "Oh that park only has Star Wars and thrill rides, we'll take the kids there when their older." By diversifying each park, they appeal to more people. Hence why Frozen is coming to EPCOT and not MK.