Matt Cutts has changed his mind about retiring from Google... as previously reported here [webmasterworld.com
...and he has staked out Google's right for perpetual change in this April Fools Day video, which carries a short but long-lasting message.... When will Google stop updating its search results? Matt Cutts - trt 1:21
Apr 1, 2014 http://www.youtube.com/watch?v=1Cjz_kJGtS8
Q: When will you stop changing things?
MC: Look, I'm sorry Dave, but I can't do that. The web is always changing. The things that we think we need to do for users will always be changing... and of course spammers and their techniques are always changing. So we're always looking at ways to rank results better, and the result is flux... and there will always be change going on in search results....
As if to underscore the nature of everflux, the color of Matt's shirt changed throughout the message.
His takeaway suggests that the bar is always going to be rising. IMO, it is a very useful bit of advice to SEOs, and a challenge for those of us who want to stay viable....
SEO in many ways is about change, and the ability to adapt, and evolve, and to return better and better resources for users.