While this certainly sucks, it looks like I'll emerge relatively unscathed. I earn probably 80-90% of my miles per year from either *A partners or Japan issued Mileage Plus affiliated credit cards. The fares I fly on *A partners are typically mid to high tier so hopefully that won't be affected much, in all it looks like I'll probably end up with about 10k fewer RDMs per year from my annual trip to the US after this and EQMs probably staying about the same. I can probably even switch my US trip to NH metal for the overwater segments (where I have a pretty good op-up percentage) if I don't need the full 3x 70 baggage allowance coming home.

I really feel for the people with cheapest fare travel policies who fly heavily on UA metal. This didn't take long for UA to do after DL announced it and I fully expect AA to do the same.