Most of the media coverage of his announcement has focused on a narrative of Yahoo’s demise. The Information Week article that I linked to above is probably the most neutral article I could find, and it still slants towards making a bigger deal of this change than it probably is.
I’m not much interested in whether or not this represents a larger trend for Yahoo. What matters for those who are concerned about site performance is that Steve has been publishing some of the best research recently on these topics. I hope he will continue to be able to publish new research and techniques while at Google.