No second team is not going to come close to having what the Broncos have, so get that idea out of your head. It will take decades to compete with them if ever at all.
'Man City will never be as successful as Man Utd again', 'Fremantle will never be able to compete with the Eagles', 'the Cowboy's will always play little brother to the Broncos', 'the people of Sydney will never support the Swans in numbers', 'there's no chance that there'll be a professional RL club in Toronto in our lifetime', etc, etc, etc.
The same sort of stuff is repeated over and over by those that are incapable or unwilling to envision a future where the current status quo is radically changed.
Sure a second Brisbane club may only average 20-25ish k a year instead of the Bronco's 30k, maybe they don't pull in as much money for selling sponsorship space, maybe their ratings are a bit lower, etc, etc. But the money, support, and will is all there in Brisbane to create another club that is of similar scale to the Broncos, and so long as everybody plays their cards right there's no reason why the NRL and it's partners couldn't achieve another club of a similar scale to the Broncos creation.
However if the NRL go with a regional or suburban club that's what they'll get, and it'll be a massive waste of a place in the comp and every bodies time and money.
A brand new neutral franchise is most likely going to be comparable to the Titans or Cowboys when they first entered. The Broncos are the biggest, richest, most supported club in the NRL.
No, a new club on the Sunshine Coast or in CQ would be comparable to the Titans or Cowboys: a regional population that is spread over a relatively large geographical area without any real central location population wise to base in, without the high amount of corporate or sponsorship interest in the region that is natural in regional areas, etc.
Which, BTW, is why the NRL shouldn't even bother with the SC or CQ (or other regional markets in QLD and NSW) while markets like Brisbane, Perth, Adelaide, Melbourne, and the Cities in NZ, are under supplied.
A new club in Brisbane would/should be most comparable to the Crushers before the SL war really kicked off, or the Fremantle Dockers and Port Adelaide Power.