I am surprised that with the crap that just happened that sites like ALN as an example at least dont start to implement blogs that are separate by niche. Input posting that has images, videos, no anchor text in some posts. Have some tagging that goes to authority sites with do follow and no follow. Add some automatic commenting that are based on the tags with the same do follow and no follow linking to authority sites and Also limit the posts per day on each blog to random numbers from 3 - 8 for example. I don't think these networks would blow up so bad if some measures were taken like this and its not hard to do.