I think it's more a case of; if they do actually deliver something new people get thrilled as it's been a decade in the works
. Forza 4 had a great livery editor for example and that was already 5 years ago...
Doesn't matter if Sony would decide the direction or PD could do it themselves, they wouldn't be able to manage anyway.
Imagine the $$$ that are pumped into this studio on a yearly base, and then look at the end result and you'll know enough. Other studios can only dream of this but even still they do release games that are of a much higher standard quality wise.