I do agree that Google is not the cause of the problem, however they are in a unique position... They would be seeing this data in aggregate across thousands if not millions of sites and they have the resources. So in other words, if anyone can figure it out, it would be them.
They don't "have to", but given the traffic is skewing Analytics data, it would be a noble and valuable contribution.
Question to those that have analyzed this traffic - have you gone as far as to track HTTP headers? I wonder if there is some common header being sent by this botnet.