well, firstly, about the polyphony people, yea, they have 100+ people working on the tracks, cars, etc. lfs has 3...and managed to kick gt's ass too
now, onto the ring. i think there are some good thing and bad things about having it in lfs.
most people know the good parts, so ill point out the bad
although it will be fun, the length will get tiresome wuick. you wont have 600hp porsche's roaring past you, there wont be the thrill of the armco right next to you. the servers will never complete a lap unless it orginised events, cause the race will always be restarted.
im all for it, in some ways, but one fo the reasons i love lfs, is the uniqueness. the fictional tracks that we all love. you cant compare anything to anything else in rl. i really like that. adding real tracks will make it all the more complicated i think.
maybe add a new track, and maybe a few new configs, and for tracks, i thnik thatll do.