They need to release FF VII and KH 3 first. SE/Nomura doesn't know time management with their big games.
FFVII-Remake announcement will be already 2 years and we still don't know when the game will be release.
KH 3 is 4 years from it's announcement.
Although possible when will that be release 2020?
They to finish the game that was announce first and then proceed to the next one.