maximillianos - 9:56 pm on Apr 5, 2011 (gmt 0)
I'd say anyone that gets a majority of traffic from search is not algo proof.
Now if you have a newsletter with a quarter million subscribers or a facebook page with 50,000 fans I would say you are more algo proof. Or any other non-search sources of traffic as the majority of your visitors. That is where real stability comes in.
My newsletter is only 10,000 strong but my goal is 100,000. Then I will feel algo proof. :-)