How about the food has gone down and it's not worth it anymore???
Seriously, I am aware mostly of Chef Mickey's deterioration over the past five years, since for the characters and DD we go every year.
Mostly, I do agree that menus have been "dumbed down" in some of the better restaurants to suit the masses, and I am very very disappointed in the addition of more and more buffets, which saves Disney a bundle and decreases quality. As long as people keep attending these character or show buffets in droves, tho, the proliferation will continue.
I have no idea what Kona's was like before, but we found it to be extraordinary this past trip. Le Cellier is good, but not worth the raves it gets here.
PTC has definitely decreased in quality since we started going to WDW 6 years ago. DD had greasy, stringy pot roast. When you miss on a "signature" dish, something's wrong. Ditto Yachtsman Steak House. IMHO, if you call yourself a steakhouse, then the steak had better be as ordered.
In January, we'll return to Brown Derby and Hollywood & Vine after skipping it a couple of trips. We'll just have to see...