Yup, this is already in progress with the 777s J seats being reduced. DL wants to sell 8k+ tpac and tatl BE tickets, and apparently thinks they can. At the same time they drive the price up, they are also limiting the mileage earn to 75k a ticket, and then hosing pax who sit in the back with reduced mile earn.
I honestly am not sure how this all makes sense. Do they really think pax are going to pick a DL BE seat for that much money when other airlines have much lower fares just because DL inflates fares by pulling seats? Or are they only interested in corporations who have contract/discount rates for those J seats?