Is it me, or is it starting to get a bit Jungian in here? Only a bit, of course, but some of this is echoing similarly.
If one were to geographify (try saying THAT with a mouth full of peanut butter) - uh, or just 'make a place for' the idea of 'collective unconscious', one might get something like the Astral realm, with its vivid emotional content, echoes of the past, quick-as-thought processes, spirits, and all that. The Shadowrun 'verse has spawned peculiar folks who are more in contact with that side of things, i.e. magicians.
Now, as the world and its tech develops as it has in this lovely fictional setting, the man/machine line gets thinner and thinner, and perhaps there are enough people with that, slightly different understanding of things to meet a critical number to create a 'competing' worldview/common consciousness, which is this Resonance schtuff. In this universe's pattern, there also exist folks with more connection to it, being the Technomancers and Otaku.
As 'life' creates the Astral realm, so does it create the Resonance, but in the paradigm-shift kind of competition vein. They are mutually exclusive (one cannot believe x-not-y AND y-not-x, after all).
Sorry. Kind of got waaay over here with that. Interesting thread!