Final Fantasy VII Remake will be released between the last months of 2019 and the first months of 2020
If we have Square-Enix + Tetsuya "Slow Turtle" Nomura + Problems with Luminous Engine and its awful optimization + Slowness of the developers + New Console Generations and Change of Engine =
Easy will launch in 2024
And its a blessing because they have already the characters, Story, OST, System Battle...
if was a new game probably 2029.
Actually, Final Fantasy VII Remake has always been made, from the beginning, with the Unreal Engine 4.
And the only big change that has taken place during the very first stages of development has been the change of development, from external (with CyberConnect) to internal.
[and it happened between 2015 and 2016]
This is the only thing that happened to the project, nothing else.
Furthermore, Final Fantasy VII Remake is now in excellent health.
And in an advanced development phase, which will lead to the likely first game demo that we could play in the near future.
So it is not wise to be pessimistic, on a non-solid basis.