I have a feeling that's exactly what they're doing this time, hence the anime is no longer focusing on a single region.When its less than a year out then yea, theyre kinda stuck with the date they chose since every other part was moving around that date. That being said if GF said "hey we're gonna need 5 years till we get gen 9 out" then TPC will work around that.
I can see the DP remakes next year or 2022 plus DLC, and then Gen 9 in 2023/2024.