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It depends on what you want to do, also. Myself, I'm running a basic forum and have absolutely no need of CMS or Articles at all. WordPress cannot do what I need at all, only another forum software could. And I looked at every highly rated free software out there and not one of them came close to Vbulletin in flexibility and options. I even installed two different forums to test out before realizing that free software just wouldn't do the job.

Maybe Vbulletin popularity is dropping a bit, but if that is indeed the case, it's because of the change of focus from forums to blogs. I look at that as nothing more than a fad and think that forums will always be popular and cannot be replaced by a blog with people commenting on a principle statement or story. A forum provides a totally different interactive experience that a blog simply cannot replace. Forums are like rock and roll. It may have ups and downs, but it's not going anywhere!