The replies are great, however they seem to only glance at my question.
Has there been any mention of what the otaku are up to as adults?
Ancients are doing this. Horizon is doing that. Riggers are changing X. Otaku are... working 7 to 9? Did the few, unchanged survivors go to ground and mesh back into normalcy? Are there secret "therapy groups" to cope with losing touch with Resonance and no longer having a tribe? Has anyone caught wind of a post-fading otaku outside of Puck?
Shinobu, I think your last question kind of answers itself. The Ancients, Horizon, even Riggers (as a generality) all exist still. They are groups that are involved in doing this and that. Even Riggers, which aren't so much a codified organization are still a recognized "job" (?) so there are updates on what the latest and greatest of them are doing.
Otaku, as a group, don't exist anymore. They aren't 'up to' anything. Even before Technomancers, Otaku "aged out" of their powers, so it doesn't seem surprising to me that there just aren't any around anymore. With the emergence of Technomancers, there aren't any new kids becoming Otaku, and at this point any who possibly survived all of the events leading up to now, I don't think any of them would still be young enough to still have Otaku powers anyway.
And past that, even if any of the former Otaku are out there doing things in the Shadows. If they are making a name for themselves, it wouldn't be as Otaku, they would be just identified as whatever it is they are doing now. There might be a handful of runners out there that have a history of formerly being Otaku, but that would be a deep backstory sort of thing.