This forum just feels neglected to me.
it needs more than just routine maintenance, and that's all I really see getting done. There comes a point of diminishing returns, however, so I completely understand just letting things go...maybe it's time to put AC to bed.
So long as profits are being made from advertising (and maybe sponsorship), the forum is likely to stay up and running. If it were to become a financial drain, I would expect it to disappear
There's potential here, but unless an effort is made to rejuvenate the site, from the top down, little if anything will change.
As noted, there are other forums that are doing well, and really well. If the owners/administration here wanted things to change they could look into what is different, or maybe ask people what they would like to see changed.
A community is nothing without it's members, there is little value to the infrastructure alone.