Personally, I feel RoR is the closest you're going to get without the use of a gaming computer. The tracks and trucks I see coming out of here, just blow me away with how much detail they have in them and yet, how little of an FPS drop-age they have. To get a full on sim, we would most likely need crushable cars, tracks that get worn down over time, and a slight physics adjustment. Most of this would probably cause a good bit of FPS loss. With RoR, I feel we have the best of both worlds, for people with good high quality computers, and the standard laptop from the early 2000's.
By all means, we could use a bit of improvement to make it even better, but I'd say we're at a pretty good stage right now. Just my own little input, but hey, if anyone wants to get it even better, I really want to see what this group can come up with, because I know for a fact, that the guys on here are MORE than capable of putting out a better game than Activision, or anyone else can.