Unpopular opinion, I think SE desperately needs a new successful IP more than a successful FF title. Square needs something like what Dragons Dogma (2) did for Capcom. A breakout IO thats succesful. DD 1 sold over 7.5 million units and the new one sold 2.5 million units in 11 days and its performing well enough for Capcom to call it a big success.
FF has dried up, another title might sell 5-7 million units or 0.5 million units more if it releases on Xbox as well, but the IP simply isn't as relevant anymore. So if Square continues to make FF titles, they should opt for making one that's profitable when selling 3.5 million units.
Please excuse my (probally) poor grammar