Leaving NSW out or are they part of NBL1?
IMO if all teams in those leagues were included, eventually, in NBL1, then there definately would be issues of costs and schedules. QBL has 14 teams, NBL1 umpteen, etc. How to pay for all those games and when to play them!
Couple of representative/regional type teams, rostered with players from their regions' State League clubs collectively, couple of imports per team.
State league teams not disrupted at all. And this is important! ALL OF OUR PLAYERS START THERE.
So, local assocs play in their states' leagues as they currentl do, no changes. (3rd tier - nationally).
NBL1 (or whatever name) develops a national comp with rep/regional teams (as described earlier) with a couple of NZ teams (if you like). (2nd tier).
NBL (top tier).
[NB*: NBL1 and state leagues don't compete. NBL1 competes with NBL. Sorta like most footy codes, I guess. So, your NBL team is on an away game and your NBL1 team is in your region (at least), you can still get live, top level b/ball all of the main season, with your local team doing what it's always done. And your fave players are avail all year and your best players, a chance to really crack the NBL.]
[Further NB*: Let me rant about the Standard of teams I would expect. In Qld (which I know best), with 2 regional teams in NBL1, North and South, as described prev post, I know we could offer 2 great teams. Current NBL1 could possibly offer 5 or 6 great teams but still only allowed the 2, maybe 3 if say Tas/WA/ only offer 1 each. No more talk re NBL1 teams would sh*t on any other teams or Qld beter than NZNBL. Couple of teams for each state, with players chosen from "their" regional assocs' state league teams, with a couple of imports each, would even it all out.]
[Further, further NB*: DPs. NBL Development players seem to miss out on any benefits, so far. They are already tied up with their NBL clubs' schedule. Here's what could happen. Nothing different, a DP plays state league in his off season and bench for NBL season. Or, NBL clubs get involved in this 2nd tier by renting their DPs to their local 2nd tier team for their 1st year.]
That's enough, unless, of course, I think of anything else I know you all want to read!