Google has probably achieved the opposite of what they set out to achieve, I've got a few sites that are head & shoulders above our competitors that have been hit to the tune of ~90%.
I'm reluctant to change too much because there's still so much unknown, anyone that I've seen come back hasn't changed anything. The ones that have, recover then get hit back into the abyss again next update.
So whilst those sites that we were really active with sit & rot, I've moved onto other projects. Google has just contributed to two of my sites becoming stale, there's no point me putting the effort into keeping them going when 90% of my earnings are gone.