Agree with your point on people travelling from Toowoomba but people from Redcliffe, Ipswich or any other outer suburb of greater Brisbane are used to having to travel to Suncorp to watch NRL footy so I don't think it will be a problem.
Honestly you are beyond delusional if you think that a significant number of people are going to travel 40km+ to Suncorp in peak hour after work on a Thursday or Friday night every second week in Brisbane.
A few thousand maybe, but not the tens of thousands that are needed to support an NRL club.
That there is the big problem with Ipswich and Redcliffe, they're outer suburbs clubs whom unless you make significant changes to their brand, will appeal almost exclusively to people from those outer suburbs and will alienate large portions of their potential fan-base elsewhere in the city, whom will be forced to play the vast majority of their game on weeknights in the heart of the city.
It would be like if Penrith, as the Penrith Panthers, came into the comp playing out of the SFS. An insanely stupid idea that nobody would take seriously.
If you let them into the comp they are going to have to contend with those factors, but so far Redcliffe has utterly refused to do that in any meaningful way, and who knows what's going on with the Jets at the moment, but considering that they are still referring to themselves as the Jets the odds aren't good.