While I would enjoy a return to mass animatronic usage in rides like it used to be at Epcot, the age of AA's at Disney is coming to an end. Disney is keeping its rides that use them already (and sometimes updating them) but not many new rides feature more than one or two animatronics (if any). Lets face it, AA's are very expensive and aren't the easiest things to maintain when they run for a full day. The thing is, that lately, the rides being built have a main plot and its full run only focuses on that main plot. In classic attractions like any of the Omni-movers at Epcot (except the Seacabs) you could always see something new when you rode the attraction (not really new but new to the rider). Rides like Horizons and JII were filled with so much to visually intake that it was impossible to see it all in one ride-thru. Nowadays, with rides like Test Track and Mission Space, the only extra things you can look for are the small tributes to the previous placeholders and an occasional hidden mickey. Disney has changed its philosophy on detail and expense, both play a role in how attractions are made in this day and age.
Everest is actually the only exception at the moment, but that is because Joe Rohde made it his pet project (being that Animal Kingdom is also his park).