If they were mages, they'd show up as something other than mundanes on the astral. But in Augmentation, I believe, they were discussing the possibility that magic and resonance were flip-sides of the same genetic trigger. Which is why you can't be emerged and awakened.
What this could mean is that it was the interaction of both the increasing mana and the saturation of the matrix that allowed otaku and technomancers to develop.
Of course, as one shadowtalker said, if the otaku were the equivalent of UGE and technomancers were like Goblinization, what would the matrix equivalent of SURGE bring?