Well I just think that the target demo changed during the 90's. If you listen or read about the fandom during what some consider to be the anime golden years (80's), there was a lot of people who were older and rather interested in finding out what else was out there for animation. It was this interest that brought people together and allowed a convention to be a place of what conventions have been thought of by older otaku or as the article mentioned (Oldtaku). Because of the shift of the 90's especially after NGE, BSSM, DBZ came out, a couple of things happened. Younger kids got attracted, anime became easier to find, and by the time the 00's came around, the old ways of getting anime was all but gone. I remember the days where IRC was king and you had to serve in order to get files through a barter. That usually spurred conversations about what ever title you had, what was coming in the grapevine, and what to watch out for.
Now it's all streamed. Kids convince parents to let them go to cons more so for the independence than the genre. Parents just want a weekend off where they don't have to worry about a kid and the cost for a babysitter is the same sometimes for the 3 day visit for the con. Conventions don't really turn away money because they gotta break even. Now there's a mixing of generations that can be as volatile as oil and water.
I also have to admit that anime itself isn't the way it used to be. It used to seem that every title from Japan was great and had some sort of depth to them. Now they're just pretty or work toward a fad of the week, like DFC, Loli, and subgenre Moe. There's a move to get manga into e-readers and possibly into slate-like devices.(
http://www.orangeanime.com/phpbb/viewtopic.php?f=6&t=19876&start=0&hilit=e+reader) Interesting stuff but a bit off the beaten path from what the article touched on.
I used to think I knew where this industry was going, but I've been surprised especially as of late. I like the new digital era, but I hate what has happened with the community in some respects. Maybe moving towards clubs and groups and social networks is making a return but as far as the conkids go, it will stick around so long as the industry and conventions cater to it.