Not just visually. Increased computing power and richer game frameworks will make for more compelling AIs. There are advances in procedural content generation

Not just visually. Increased computing power and richer game frameworks will make for more compelling AIs. There are advances in procedural content generation that are getting past the saminess of endless variations on "kill ten rats." Open modding platforms (e.g. Minecraft) create whole communities around them, and endless supplies of content. I think we're still in the infancy of that trend. The immersivity of VR will make gaming experiences qualitatively more compelling than the screens of the past. There's a lot more going on than just increased polygon counts.