I sure hope 17 is going to be a new MMO, or they are cooking another one. I think it's clear to me that changing XIV to FF online would be a massive mistake.
I think the devs didnt really understand that Dawntrail was supposed to be a fresh restart for the game both in gameplay and graphically. And perhaps they are incapable of executing it.
It wasn't enough to redo the graphics, which yes, it was needed for a longer continuance. The gameplay experience had to evolve with it and it simply didn't. The content release cycles got far worse.
Thus, I think the best route here is to release a new MMO to provide a breath of fresh air and a vastly different gameplay experience most players are craving. This is such a great game, well executed, relatively few bugs that it is actually amazing just how STALE and SLOW the formula to content has to be to be killing it.
My point is, start working a new MMO. I don't think this product will recover meaningfully, but it is a really good game, so maybe another calamity isn't needed, it can go on maintenance mode like XI and that wouldn't be a bad thing. Quite frankly, I can't tell the difference about whether the game is maintenance mode or not anymore.