Pretty much this. The difference is probably up there with the switch to color, but not as drastic as the switch to sound.Much like cinematographers and set designers had to adapt to color, and are trying to adapt to high res digital.
I think the term "uncanny valley" really should be limited to effects that attempt to mimic/model mechanical reproduction of images, i.e., CGI. Applying it to different methods of actual image reproduction is a misuse of the term, as the issues have less to do with the physical mechanics of perception than the psychological aspects of it. Mind you, that's a spectrum, not a black and white thing.
But the analogy the article makes to acting conventions is so vacuous on its face I can't believe they printed it. Yes, acting conventions changed after the introduction of sound...but the major trend in acting conventions after 1929 has had much less to do with technical limitations than with culture and style...in Western cinema at least. The Actor's Studio has had more effect than the sum total of technical advances in film over the last 80 years.