Who would have (should have?) fought harder?
The NRL was product of two partners.
The ARL - who wanted to preserve Sydney clubs, and may have had a chip on their shoulder about the Reds defecting to SL - they surely didn't mind the Reds, Rams & Mariners being axed, as they were "low hanging fruit" when it came to reducing the competition size without rationalizing Sydney too much - and they even left the Chargers out to die, despite being one of the few profitable clubs during the war.
News Ltd - now, Melbourne was always the market they always wanted to get into, and scrunching down the Reds, Mariners & later the Rams into the Storm Squad meant they could get into that market with a strong team pretty much right away. Plus, Melbourne is a closer & bigger market than Melbourne, and the reduced travel costs probably played a role there too.
In brief, the short-term "cut costs, reduce teams" environment of the early NRL made it all too easy to axe the Reds, BECAUSE it was all short-term thinking at the time.
Anyway.. do we have any more updates on the whole Perth Bears idea recently, or is it a total dead duck?