Most forums have seen a decrease in traffic and this will most likely continue. It is an industry wide trend.

I believe the cause is that through the internet there is now, different media platforms, more entertainment options and the use of mobile devices to access the internet. Within the last year or so internet access by mobile devices has surpassed access by personal computers.

Forums being more texted based then mobile applications are not as popular as they once were. Forums are more accessible by personal computers, but the usage of personal computers is decreasing as a percentage of internet usage.

Compared to a decade ago, the consumer now has many more internet entertainment options; streaming media for example. Which draws traffic away from the more traditional forums

Cheers!