Nomura had to help other projects multiple times. SE made him postpone his project to help with FFXIII/FFXIII-2/Lightning Returns FFXIII, and to help save FFXIV.
Also let me remind you, FFXIV is a smashing success, and is also SE most profitable game, AND XIV's revenue pays for a lot for XV. So thanks Nomura. Wouldn't even have an FFXV without FFXIV and its devoted community.
Nomura had nothing to do with XIV. He wasn’t brought in to save it. That was, and still is, Naoki Yoshida.