I would say that the people who purchase the DDP actually spend on average more money on food, then the average person who is attending the parks without. An average family of 4 is spending at least $100 a day on the DDP. I would say most people while at the parks spend their money at CS, and often times eat breakfast in the rooms, and split meals whenever possible. This board is for Disney fanatics, who want to experience everything, and to them dining is a big part of that. The average WDW guest is not like that.
I'd hardly classify a Disney vacation as cheap, value or deluxe. Just varying degrees of pricey. I could have easily gone to Europe with the amount I've spent on two WDW vacations this year, and I stay at values
I think changes in food also have a lot to do with the price of food going up. A friend owns a meal prep franchise, and because the cost of ethenol has gone up, anything that eats grain, i.e. most meat, has dramatically increased in cost. Since January, a case of chicken has gone from $19.99 to $27.00. He flank steak has increased $14 a case.
So maybe your smaller filet has less to do with the "value crowd" and more to do with the cost of food. JMO.