As late as February this year they still wanted to expand to 16 teams by 25-26. I suppose the season still won't need lengthening with that.
Do you mean there's no room in the overall sporting calendar?
Let's make a few heroic assumptions.
1) The ALM has 16 teams by 25-26.
2) The NST has 16 teams by 25-26
3) ALM clubs come into the Australia Cup at RD of 64
4) NST clubs came into the Australia Cup at RD of 128
Then the ALM clubs could have June off after a 31/5/2025 Grand Final
July and the beginning of August a League Cup played over 5 weeks
August and the beginning of September Australia Cup later rounds
13/9/2025 NPLM Grand Final
20/9/2025 Australia Cup final
27/9/2025 first ALM round
That would mean if an ALM club made the final of the League Cup, the Australia Cup and the ALM they would play 52 games over a 48 week period. The pre-season games will be competitive games rather than glorified training sessions. This is ignoring any AFC games.
For NST clubs they would have more competitive games with ALM teams than they already have and because of the timing will likely win a fair percentage of the games.
More competitive games against strong clubs will benefit both the ALM and NST clubs