Short term they'll get bigger - that many rep coaches from the one club will only lead to player migration. But as you say - the wheels will fall off when players aren't happy at a lack of progression etc.
For me the interesting one is the waimak situation - it may also open up stronger north canty rep teams with it moving away from a waimak driven entity.
Also had a chat with someone today saying prebbleton fc want to enter saturday comps from next season - will mainland budge from the 'no new entities' ruling of recent times?