Like, the oldest 4th gen groups are either in their 4th year or about to enter their 4th year soon, in the first half of 2024 the oldest 4th gen groups will literally be renewing their contracts. Groups like the boyz and fromis_9 entering contract renewals will basically trigger the shift.
Besides 3rd gen lasted 6 years so 2018+6 = 2024 is when 5th gen will start forming itself, kinda wild.
Now or next year would be the perfect window for YG to debut YGNGG otherwise I guess they skipping and jumping directly into 5th. lol