I bet those people saying that real tracks aren't needed would love one to be put in. Driving any of the cars, especially one similar to your own, round a track that you could go and drive in real life would make this game even better. I know it isn't needed but you could say the same thing about fancy graphics which a lot of people still want.
Oh, and, I don't want the Nurburgring in LFS. I know it's like the most legendary track in the world but I don't really think it would fit in LFS with the small amount of players we have. It would also be absolutely rubbish for pick-up races. I mean, who wants to spend between 6 and about 20 minutes for 1 lap, especially when after the first few miles the grid will be spread out loads.
In summary, I would like at least 1 real track but not the Nurburgring, it would just go unused IMO.