Irrelevant.
Problem that many, many, many GTP members are often facing when discuss sinilar issues is subjective perception.
They just can't comprejend how there are millions and millions players outthere that loves, buys and plays GT games fpr what they are - and they do not even notice 99% of *issues* discussed around here as various critcisms, whishlists and so on and so forth.
Cattering both mainstream in vast, vast, almost unimaginable scope and in the same time pleasing many of hard-core is the greatest achievement of GT series. In the same time, GT series didn't have to sacrifice any of its unique philosophies and under even greatest surprise, it even managed to become more and more "hardcore" with each new game without alienating the casuals.
Also, even the great criticisms series has endured with last 3 "big" games (compared with almost perfect revies for GT and GT2 back in 1998 and 1999) didn't break the success of the game. Also, its only main contender on other platform never managed to catch the scope of sales, mainstream audience and commercial success despite astonishing investments in marketing, promotion, production and PR.
PCars will not jeopardise GT series by no mean, nor any other project I am aware of actually can.
Mimesis and philosophical aspecta of GT series has started its life with B-Spec mode of GT4, continued woth online aspects and options pf GT5

and GT5, with absolutely unique spin towards new, young generation of players through GT Academy.
GT series will end one day, but not soon. At this point of time, GT celebrates its 15th anniversary during which PD produced 10 titles (with 11th ready to be published in next few months) combining +70M sales on 4 different platforms, with 5 entries gaining more then 10M sales. During those 15 years, at least 3 generations of "gamers" have been raised and all those generations embraced GT series with the same passion.
The future is bright for GT series. Personally, I grew with it and it is my greatest hobby fpr almost half of my life. I would be very happy if I will be sane, healthy and capable to play it for next 50 years.
Witnessing the prospect that GT series has brought to driving genre in past 15 years, all I can wish is that more other series embark on the same path of finding the perfect blend of mainstream accessibilty that in the same time intrigues the hardcore that much that they are spending countless hours in talking and discussing GT series on the internet communities instead actually playing it
All of that - together - is making GTgames a better games with every new itteration. And that is the greatest achievement of the small team named Polyphony Digital.