I think you’re conflating the Gartner Hype Cycle with the Uncanny Valley. At least that’s the place I’ve heard of the Trough of Disillusionment from before.
Most every modern game uses Mocap, is there a reason you mention stalker aside from its recency? What do you mean by cheapness? Mocap is the best means of capturing realistic animation to my knowledge.
Nope, can’t say I’ve ever heard of this before