While yes, we can push the amount of information displayed to high enough levels (e.g. resolution and bit depth) that fidelity shouldn't matter anymore, there are still colors that we can perceive which are yet not in the standard RGB color gamut, and similar issues regarding sound reproduction, e.g. the unnaturally consistent and repetitive reproduction of in game sounds.
Besides which rendering methods, A.I. programming and physics simulation are all far from having attained the fidelity required in order to be similarly complex to our senses as the real world is, even as reproduced on a monitor and sound system.
But yes, it is true that small refinements and occasional novelties will be the driving force behind game sales. That's not really a change.