Graphics aren't really the problem anymore. We've already reached photorealism, and iterative improvements to render it in real-time are developing quickly, while the hardware gets more powerful, efficient and cheaper.

The bulk of the progress will be in human-computer interfaces. We're still mostly interacting with keyboards, mice and 2D touchscreens; voice recognition is still primitive; XR is still experimental and nobody wants to strap a heavy headset to their face, etc.