The sphere is not inactive now, but if you browse older threads in GT, you'll see a wider range of discussion, from a wider range of voices, than you see now.
Yes, the internet is becoming more and more central to our lives, but it is also becoming more centralized around websites like Google, Twitter, Facebook, etc. Forums are not the dominant online social outlet now, the way they were when I was first starting to socialize online (2004 or so). Young poets looking for online poetry communities, for instance, are probably plugging in to poetry twitter, not seeking out places like the Sphere or PFFA.
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