I mean....FFXI's last paid expansion Seekers of Adoulin was literally the last PS2 game printed in Japan before the end of that console's life over there, and only 2ish years after that did they terminate support for PS2 (JP only at that point) and Xbox 360 (JP?/NA/EU) FFXI clients. SE has definitely shown they are willing to ride certain platforms till the wheels come off the blasted things in the past. They'll only drop PS4 support when it gets to the point the PS3 reached where that small amount of RAM was a massive headache for the team, and dropping the PS3 only happened as quickly as it did because many XIV players upgraded to a PS4 in large numbers really quickly. With the chip shortages stalling PS5 proliferation (technically the combo of bots and the chip shortage) SE is definitely not gonna drop PS4 support for the game until player numbers themselves get there and given PS4's install base and with all the pandemic supply issues, that's not happening anytime soon (the pool of last gen console players is too big and the current gen pool much too small and growing much too slowly).