Cyber Connect 2 was making FFVII Remake when it was announced. It was scrapped 2.5 years in and rebooted as an in house project.
FFXV did not take them 10 years to make, in fact full development on it started in 2012. Versus XIII was fucking vaporware that just had some cgi trailers made for it, not sure why people still think it was in development all that time.
We have already seen how fast square can churn out a trilogy once they already have engine and assets in place with the XIII trilogy, that's probably the same thing that will happen with this. 2-2.5 years between releases.