Sorry to come late to this one, we've had visitors.
I agree wholeheartedly with you Genghis,there is room for Forums, but they need a strong raison d'etre to flourish. If they are just a chatting centre then FB works just as well, and it was always likely that the newer medium would drive out the old. Is that trend reversible? I cannot even guess.
The other factor about social media, as you rightly hint, is their occasional descent into confrontation and aggression (though as we know Forums are not immune to this). There is also a tendency to shorter, snappier responses which seems to suit the present time-poor age. Lengthy considered responses are uncommon it must be said although they are of course generally the most useful.
How do we revive a Forum? I've got no idea, but we can keep plugging along in the attempt.
One day has arrived!