Thats an interesting point, I never thought about just how hard core the GT series really is.
I mean who would race in a series of 10 races, 20 laps each with a required setup change before every race (unless you jump in the damn Escudo)? I definately would.
But on the other hand will it be nessesary for GT to follow the lead, heading more in the direction of an increased fanbase, leading to a less hardcore game? There does seem to be alot of complaints by people in this forum about longass races you cant win easily.. that may be a form of achilles heel for the GT series as we know it (unless there are way more hardcore car fans out there than I think).
Heck untill the finished products come out, we wont even know if they will directly compete for the same type of player, Forza, despite its really nice driving physics, may appeal to the more casual gamer, while GT with its vast amount of cars, and the advanced, precise adjustments required for a competitive race may only appeal to the hardest core racing fan.