I don't think gt7 need rt so much, its need more sharper and stable image, day night cycle and much better environment details like 3d trees, bushes etc
The GT7 footage was already 4k native and was a sharper image than GTSport, that didn't help it look drastically better than GTSport. If PD can also implement ray-traced global illumination then we can have dynamic day night cycle and still get close to visual quality of GTSport's baked lightmaps. Direct-lighting and shadows were already real-time in GTSport. Agree with environment details.