The issues with r4 could be fixed with new hardware, bad resolution and trying to push the hardware too mch but honestly I'd rather see more of the original ridge racer style and gameplay.
More courses like that would look and feel insane with a semi update with incredible IQ and 1080p
I'dd be fine with a very similar look as long as they enhanced the IQ to look amazing and maybe a mode that has more up to date post RR6 textures. Either way, like those old course designs a lot more than the recent stuff.
I think flat shaded cars can look incredible with increase in IQ and polygon counts. People think solid shades of colors look bad but that isn't exactly true nor is it true. When you think of textures you can get a nice blend of artistic styles that still look good.
I'd hope to keep the art style and crank the IQ a lot more than say this, and maybe a mode that uses textures a little closer to the original
I'd want the new game, tracks to look like this but a bit better
which artistically is more fun and intereting to me than any of the RR games.