With respect, I've heard the whole "goes in cycles" thing before and I'm not sure that's what this is. These forums have been in decline for well over 2 years now with no real sign of picking up. Heck, there are sub forums on here that haven't been posted in for 2-3 years (like the Pressure point forum).

Other MA site forums at the moment are positively thriving.

I can't tell you why that is happening, but I think there is more to it than being cyclical. I think one reason is that there are lot more specialist forums now online than before. Really good forums dealing with specific arts. So say a person is only interested in Aikido, Chinese Internal Arts or BJJ, there are really good forums for these subjects.

So I guess part of the reason for the decline on FA forums is increased competition from other MA forums.
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"Let your food be your medicine, and your medicine be your food" Hippocrates.