With all due respect, I think what you just said proves the "dumbing-down" observation.
By loading-up the signature restaurants with folks who would not normally eat there, and experience has shown will order the most expensive things on the menu just because they can, Disney has no choice but to limit what they will offer.
Right now, Disney needs to get butts in the seats, that's it. Covering overhead at the higher-end restaurants is the key.
Sadly, what this has done is diminish the entire Disney brand. It's just easier to notice in the sig retaurants when they are filled with tired, irritable children, and parents dressed in park clothes that have been running since 8:00 am. No dress code enforcement, limted menus, and a lot more noise.
Signature dining at Disney wasn't just about the food, it was about the atmosphere. The introduction of the DDP has lowered the bar.
Until it costs at least three DDP credits to visit a sig, or drop their availability from DDP altogether, it's not going to change. I'm just really curious how many of the folks on DDP would pay OOP to eat at a sig restaurant.
This isn't a condemnation of the folks on DDP. After reading some threads on the subject, I recognize it has value for people, even if it is just a budgeting tool. However, the effects on signature dining can not be dismissed.