To an extent, I agree with you both that people (especially Disney guests bc of the cost) expect rides when they go to theme parks. However, I feel as a theme park called Animal Kingdom, the focus should be on the animals with rides being secondary. The problem with AK is, as a zoo it's lacking the number and variety of animal exhibits to make it a top-flight zoo. As a theme park, it's lacking the rides, shows and attractions to compete with the other gates. As a result, most guests are gone by mid-afternoon.
With so many wondrous creatures and regions not currently represented in AK that could also support rides, I find it disappointing Disney is instead using imaginary aliens. They shouldn't have to rely on a marginally-entertaining Hollywood blockbusters or Disney characters to create compelling attractions at AK.
In addition, don't underestimate what people will pay to have top-of-the-line zoological experiences. Attendance at the most-visited zoo in the world, San Diego Zoo, is upwards of 5 million annually with a $44 admission. People spend thousands on ecotourism and safaris in order to see exotic animals all over the world.
I believe that if Disney uses the time, land and resources to develop top-notch animal exhibits featuring rare animals not often seen in US zoos, as well as throw in a few rides, you will attract a bigger and more varied crowd. Avatarland, as it stands, really only makes the ride fans happy (leaving zoo/animal fans out in the cold).