The strength of the Firehawks and Dolphins bids really goes to show that in 1988 we should have created a national comp out of the best NSWRL clubs and the best BRL clubs instead of bringing in the Broncos and Giants.
By the late 80s pretty much all the BRL teams were effectively insolvent (even worse off than almost all the NSWRL clubs), so if you had done that back then you wouldn't have been getting the financial powerhouses you are getting today, you would have been getting a bunch of clubs whom would have quickly sent themselves broke trying to compete with the NSWRL clubs.
Even if you could get past the hurdles above, there also would have been massive fights over how many teams from each comp would make it into the new league, and which teams those were, and I can't see Arko and Quayle even considering it unless NSWRL clubs completely dominated the comp.
Realistically the only changes the NSWRL might have accepted is something like the QRL owning an expansion license or two, and maybe instead of the Broncos and Giants joining alongside the Knights in 88 it would have been a couple clubs owned by the QRL/BRL, or something like that.
BTW, the idea of the QRL or BRL owning a NSWRL license for a Brisbane team in the Winfield Cup was thrown around during the 80s (whether or not it was just media talk IDK), and IIRC BRL representatives publicly knocked back the idea multiple times.
Basically, it might seem like a nice romantic idea in hindsight, but it would have been an absolute shit show at the time with little to no chance of it getting off the ground, which, frankly, is why it didn't happen.