Holy SHIT calm down a little bit. They only released a window to begin with, and they announced the slight pushback more than half a year in advance of the game coming out, something some companies don't even have the courtesy of doing sometimes. Besides, it's literally in the first month of 2019 so it's really not that big of a deal. It could be waaaay worse, and so far Square Enix has been open and honest with us about it.
The only big mistake Enix made here is that they announced the game far too early, and Nomura admits that that was the case. If it was announced at D23 2014, I feel like this entire situation would be a lot different. If you look from the first Unreal Engine trailer, though, the game has only taken, like, 3-4 years? That's impressive for a universe of this size being entirely re-rendered.