Burleigh & Schoenhurr made the argument that the Uncanny Valley drives a lot of the social stigma experienced by transgender individuals. Drag queens do okay. People who pass do okay. Individuals who aren't quite adopted to performing their chosen (rather than born) gender raise disquiet that may not be conscious because of the Uncanny Valley. They weren't the first ones to make the observation, either. I remember seeing percolations of it going back ten years or more. So yes - the Uncanny Valley is surpassable. Transgender individuals do it all the time. I'd argue that Avatar made it to the other side. I agree with you, though - we watched like 40 E3 videos last night and it was Uncanny Valley On Parade. I'm no programmer but if I had to guess, I'd guess that they're all using the same plugins, and those plugins haven't made it to the other side yet.
Can we apply the term "Uncanny Valley" to audio as well? i.e. Those creepy "player voices" in E3 demonstrations (Ubisoft, I'm looking at you)