I've been thinking about the same thing that article is on about myself lately. Ever since actually moving to Japan, I've been watching less and less anime, and I was wandering why that was. It's all around me now, I have an anime-dedicated channel (amongst anime on regular channels), I live a three minute walk from the nearest entirely manga/anime dedicated shop. Yet I very, very rarely read or watch anything these days. Not to say I don't, but a whole lot less than usual.
Is it growing up? Or is it, as the article suggests, that more and more anime is just being targetted to those very specific otaku and no one else? I'd like to think the second, because if all my toys and other nerdy crap are anything to go by, I don't think growing up is the problem! There seems to be less and less awesome, original anime and more and more stuff that just repeats the last terrible show because it already has a built-in fanbase that comes with money.
I miss the old days when there was so much discovery to be had.