@Simon
For me the organic zombie patterns have been non-stop since September of 2015. Paused Adwords campaigns, and restarted them on "good days" only to lose a lot the next. If I could accurately determine when a good day was going to occur, I would have Adwords active on only those days. In the beginning the zombie pattern was easier to forecast. Now, it's much harder and most days are filled with zombies. I can't rank any better either because I'm in the top three for some of what was our historically best keywords. Since these keywords are not seasonal, associated with trends, etc., I would expect good conversions from them even ten years down the road.
As far as not buying the quarterly profit reports, I know there are some diehards out there that want to give Google the benefit of the doubt. Yes, the end of the quarter is near, but I expect Google to report great profits and modest growth again. If there were something wrong with Google, as in they are sending us the wrong visitors, I would expect this to impact Google's bottom line (fewer users, less profit, negative growth, etc.). If Google's quarterly report reflect what I think it will (profit and growth), it becomes harder for the naysayers to blame this on an internal Google problem. Instead, it supports the theory that Google is fully aware of what is going on and they are the ones controlling it. Theories such as our sites are part of some test just does not fit after six months of dealing with it. Especially with the way trends change, news breaks, etc., Google adapts relatively well in a short period of time.
Regardless of what I or you believe, we are in the same boat - getting lots of zombie traffic. I hope this gets resolved, but until it does I'm going to keep rocking with Amazon. Between Amazon's existing user base and Google's desire to give Amazon multiple listings, it's the best short-term move to stay profitable without having to deal with the headaches Google causes. Without Google I am not paying outrageous CPC, have consistent sales and forecastable profits - things that have allowed me to do the best I've ever done. In truth, I should be thanking Google for the zombies because I'm much better off because of it.