For my son's smaller city club, it's just sorta a shuffling players around a bit. Interesting, in my son's age group, they currently have 3x boys teams. The lowest tier team is almost entirely younger players, and that team (essentially) is being moved down more/less intact. But for most of the age groups, there will just be some shuffling around of players for next year. They also said some of the NPL teams may just play up next year, to keep the current teams intact.
It's too early to say for us how it will shake out, though, cause tryouts are not until April (U16 upcoming).
It doesn't seem like the shift will change much in terms of which clubs are better/worse, though. It just shifts players around a bit.