you're missing the point, it's not Wollongong or Townsville coverage , TV doesn't care about them but the fact the league can't keep teams alive is the issue for a TV deal.
if you're a TV exec,
* are you paying for 224 games (8 teams) or 120 games for 6 teams
* what happens if that turns into 5 teams and you've scheduled it
* what happens if it turns into zero games as the NBL implodes
It also has to do with brand, do you as a TV station what to be associated (and pay) for a sport that has clubs folding all over the place
maybe you do but I bet you are re-thinking how much you pay for it.
I'd put money on the NBL having a self produced mickey mouse TV deal, no sponsor and making a big loss