I've lurked on this issue for a while. I guess it is time to chime in.
I tend to think that more is better. As long as threads have meaningful names, and are started in the correct Forum, I see no objection to a broad range of travel related discussion.
I typically go to the day's active topics, reading most in my regular fora (AC, CP, UA, *) and interesting looking ones in others. It doesn't bother me in the least that there are dozens of new or revived threads that I'm not interested in--I just skip them.
I think the breadth of information is helpful. I am interested not only in FF programs, but also is general travel experiences.