Perhaps so, however what you do get from the scan would be precise locations and banking angle data. Of course there is no way to get scan data from 1966, but in its absence, it's the next best thing.Kunos have scanned the old abandoned oval and said they would make a track out of it I believe.
Not sure why one would scan the surface of a deteriorated race track as that misses the whole point of scanning imo. Unless they want us to virtually die driving in holes, obstacles, empty beer cans and what more.