AMEN. Think of your local Hospital... they need "this much" to survive. Whenever they get nailed, cost wise? They increase the costs for those who DO pay...
There is a second SIGNIFICANT DDP effect: NOTHING can appear on the menu that runs over 2 points in remuneration. This effectively "clips" the ability of a fine restaurant to publicly offer a higher end meal - even to those willing to PAY for it.
Fortunately, there are two solutions....
1) Change the terms of DDP: Prix Fixe the menu at a SIG to 2 DDP points - with cash add ons for upgrades (very similar to the Victoria & Albert model).
2) From the consumer end: when SIGS cease to be SIGS? Hit the non Disney owned restaurants. There are MANY on property: Shula's, Fulton's Crab House, Il Mulino. When these run out? Factor in the cost of a 2-way cab ride to OFF property Signature Restaurants. We are rapidly approaching the point where that cab ride, combined with better rates, meets or beats the on Property Disney cost.