What I find interesting is that no one has mentioned the Amex Platinum yearly 10000 bonus "base" miles that count towards status qualification. I wonder if they're doing away with that?
Also, with the elimination of the North American Upgrades, we now have no way to confirm an upgrade on a discount fare at booking time, unless DL is planning to allow mileage upgrades from discount fares. With my company travel policy I can't spend $1400 on an M-class fare to be able to upgrade with miles. AA lets me confirm with miles on a discount ticket, has more room and power adapters in coach for those long-haul flights. Why would anyone bother to fly DL after this?