I have loved the ongoing, long-term learning experience on the Nordshleife. Lap after lap in the Forzas striving for the "clean" lap. However, the price of over-exuberance or misjudgment in the Forzas or GT5/6 is quite low.
This proposal would put a whole new level of "reality" in the experience. High places on the leaderboards would demand even higher admiration.
(Aside from the photo-mode opportunities to capture my cars in flight or the process of disintegration!)