@Scaff
I'm not saying your thought process isn't rational, given the history of the franchise you're correct if we assume PD can't do anything to harm the series. People have always blown things out of proportion. But is this issue on a similar level?
Demos being sold at silly prices: annoying, but doesn't ultimately harm the series as we've come to expect them. Prologues are quickly forgotten by the time the full versions release. Not a big issue. Most people don't buy the prologues anyway, just the fans.
GT4 lacking online? PS2 was never known to be strong online. Network adapter didn't even come standard till PS2-slim. It wasn't a feature everyone would've used anyway. Drag strips? Would have been a tiny portion of the game. GT is a circuit racing game. Its not something that all players would even notice if it were included or not.
Now, I'm saying what I'm worried about is quite possibly worth worrying about, given the nature of the issue this time. GT has never had unimpressive or merely adequate visuals. Mind-bendingly impressive graphics (on a new system) are one of GT's main strengths along with physics. GT5 will no doubt be very successful, its a huge franchise with a lot of inbuilt sales. But the lasting impression may be that it has lost a little (or more than a little) of the mystique, the magic, the perfection. Its an issue every single player will be aware of. Its not like a feature PD have removed so Joe Schmo won't notice!
Lets go historically, as each new system gets a GT game and the affect the graphics had on my enjoyment of each:
GT1 was a smack in the face, I couldn't understand how anyone could develop cars that looked so shiny, to have that reflective quality like metal, and represent real car models to the extent that I could easily tell which model cars I was racing. Compared to the blocky polygonal cars in something like Destruction Derby, this was MINDBLOWING. I would watch the replays for days.
GT3 looked beyond sensational, it seemed so crisp and super-computery on launch. It helped GT's reputation for photorealistic realism enormously. GT3 didn't even have that many cars. It didn't matter, it sold like hotcakes. The framerate was silky smooth for the first time. The physics came alive because of this. The car models were gorgeous, and remained as good as anything in the PS2 generation for years.
GT5... 200 cars that look about as good as we'd all been expecting, but then 800 PS2 level ones that look decidedly last gen computer-gamey and actually well below current expectations for cars in modern racing games? It'll sell well because its GT, but the reputation is on the line big time. It may really feel like an unfinished game, as this time PD have LEFT IN the unfinished stuff...