Well I'm fairly certain you can avoid the uncanny valley by moving to be perfect or by moving to be slightly less perfect, something we are perfectly capable of doing. On top of that, games don't need to be photorealistic, some are stylistic. Stylistic games can already reach as perfect as they are going to get.
Anyways though, this guy is wrong for very simple reasons. 1. People have already felt emotion in games, and a short survey could tell you that they have felt just about ever emotion depending on the game. 2. People have felt emotion in other mediums that aren't photorealistic. For example, cartoons. The Lion King wasn't photorealisic and yet people felt emotions during that movie.
Anyways though, this guy is wrong for very simple reasons. 1. People have already felt emotion in games, and a short survey could tell you that they have felt just about ever emotion depending on the game. 2. People have felt emotion in other mediums that aren't photorealistic. For example, cartoons. The Lion King wasn't photorealisic and yet people felt emotions during that movie.