I dont think any game will surpass RDR2 score this gen.
But if it will be surpassed, it will be one of the three following games, and nothing else:
- Super Mario Odyssey successor
- Breath of the Wild successor
- Cyberpunk 2077
Why do you think that GTA 6 (or Last of Us 2) can't surpass its score? I think that it will at least be really close. GTA IV and GTA V got 97-98. GTA 6 will most likely have by far the biggest budget and it's going to look spectacular, especially if it's released only on next gen consoles. And if they improve its story from GTA V, I think it has a good chance of surpassing RDR 2.
"The rumours of my death have been greatly exaggerated."
- Single-player Game