That link linked to /modcoord at perhaps dozens of moderators promised to leave, which is far more impactful than users. I know just from watching kbin, lemmy and other sites grow from this summer on that hundreds to thousands likely left reddit. Unfortunately it's probably a drop in the bucket but Web 2.0 was always probably going to win. The only real way I can see of us getting out of that en masse if when each site inevitably kills themselves through mismanagement.