As a digital agency how do you explain….

As a digital agency is getting harder and harder to explain to clients that the playing field is a constant changing animal.
After reading that Google are moving to a monthly Panda update of their spam algorithm I know it will send a few clients into a frenzy. A little knowledge is a dangerous thing, in that these clients monitor their search rankings and any movement is something “you” have obviously done as Google can’t possibly update things that often.
At the information being put out there so the informed can look to blame someone apart from the digital agency or even traditional agency.
For more info: http://searchengineland.com/googles-panda-dance-matt-cutts-confirms-panda-rolls-out-monthly-over-10-of-30-days-162950