It's painful to see what is happening with PD, and I think what it comes down to is that some time ago they simply lost their focus on what they were - a company that is supposed to produce racing games. Ever since the PS3-era began, we heard of so many ideas they had, that would be included in the next game, and in the end came late or never, while sorely needed improvements were neglected. They go from one extreme (using car models from PS2) to the other (throwing away the PS3 car models that were designed to be used on the next-gen platform), and keep starting from scratch instead of finally finishing something.
It seems to me like they are a bunch of idealists that fail at a very basic level, because they aim too high and often don't accomplish their goals (and disappoint the GT-fans in the process). I still think they have all the potential they need to be great again, but that takes leadership. Kaz may be inspiring as a figurehead, but they need people who keep everybody's eyes on the ball, i.e. producing a largely bug-free racing game that does at least some things better than the other games out there.