Absolutely, we know the parks will go this way eventually. I still think a few things-
1) Size is not a factor. Anything built in Anaheim will be maximized for land use. Wherever it is built on the property it will be tight and to the point (so the concept of allowing something to sprawl in the simba lot isn't be a thing).
2) The backlot and bus loading area (as shown by Disney in plans with a rerouted monorail) has enough acreage if comparing to Avatarland in AK.
3) I have a self belief that IF they were breaking across the road to the western 'Disneyland forward' footprint, they would mention it... something along the lines of 'the first step in Disneyland Resorts future is Avatarland'.