Point taken, but I believe you got bit wrong. All the proof you need is the (hundreds of ?)millions they spend on the development of this game. If they are focusing just on the likes of the gtplanet crowd, it simply wouldn't make any financial sense. You think game companies lose money on consoles, I think the deficit would be much larger on this software, if that was the case. Reason why I put that "bit" in there is because you may be right about Kaz's rather personal aim with the series.
At the risk of sounding like a fanboy, I would like to see SONY do well with both PS3 console, and the new Gran Turismo game. In my personal opinion, GT4 did well, only because consumers bought the game on the "Gran Turismo" name. Most casual gamers quit, gave up on it pretty early by my observation(for what it's worth). Even if they quit on the game early, sales numbers still looks good, because of the fact that they did purchase it. GT5P, same deal. New console, pretty new "Gran Turismo" game, people bought them, played it for couple of hours, moved on. But I'm thinking that people at SONY look just at the numbers, and they falsely may believe that casual gamers are still very involved with the Gran Turismo game. And while I'm not saying that GT5 is doomed, I think the typical gamers are in the transitional phase of putting GT series in a ignore as we discuss this.
I can appreciate the view of the elite racers, like on gtplanet. But at the same time, retaining the casual crowd very much involved(like racing online) is CRITICAL to the success of both SONY & P.D. IMO.
P.S. Sorry my post is just all over the place. I'm frigging tired, but I didn't want to go to bed without my response, so.....