That’s certainly a fair assessment, but I would argue that the general reduction in number of AA’s per attraction is part of a ‘quality over quantity’ push rather than a desire to get rid of them over time.
Today’s guests expect AA’s to be fluid, fast, and heavily articulated. Disney has shown that they can build Auctioneers, Shamans, and Tow Mater’s, and now, new attractions are expected to maintain that quality. In the 1970’s, Frozen Ever After could’ve gotten away with painted backgrounds, static figures, and blacklights. Now, E Tickets and minor diversions alike are held to the same standard.
That’s a GREAT thing (and Disney’s high bar for themselves created this ‘problem’), but that means that every animatronic is automatically more time consuming and expensive to make than before.
When given the choice of less AA’s, but more impressive ones, or more, but less impressive ones, Disney seems to prefer the first option. Even so, sometimes they go all out (RSR, presumably Battle Escape).