Someone doesn't pay attention to XIV's news media it seems—we're entering the next ten year plan and Yoshida said he has another ten years he has planned after that.
These things were stated during the Future of FFXIV Live Stream from February 2022, they aren't making another MMO anytime soon and just plan continued expansion support for XIV.
They even went so far as calling the 7.0 graphics update the first graphics update, implying they plan to have another in the future.