They won't because the AFL will see that they start winning shortly. Their crowds have bottomed out at about 19k average after ten years of horror on the field (thats actually pretty good).
1. That just goes to show why the AFL is a joke - the NRL can have an even competition without needing to rig it
2. Not 19k -- for 2016 it's 17074.
3. From 1998 to 2004 their crowd rose every year up to 33,619 -- it's now 17,074 -- so they've halved their fan base
4. Some sources say they've been averaging $1 million+ operating losses since then each year
5. Apart from 2009 (6th) they've ranked 10th to 17th -- there are other clubs who had a similar poor decade and haven't shed fans nowhere near the extent of the Lions
6. You can't honestly tell me that if the Melbourne Storm - or frankly any other NRL club - had halved their fan base like that, that there wouldn't be serious repercussions and condemnation.
It is far more likely that the AFL will have a second team in Brisbane than that the Lions will implode.
I am so pessimistic about the NRL and big decisions that if I had to bet I would bet on AFL having a second Brisbane team before NRL.
I don't think the Lions will implode but there's a clear downturn trend in their crowds that no reasonable statistician would simply dismiss offhand.
Your pessimism is likely clouding your objectivity.