That "new feature" is almost 2 years old :-) I came to SL in fall 2006. That was the time when Anshe Chung was all over the web, and whent he gold-rush connotation was everywhere. Except for smut and porn SL has not made major news in a while. Also, those graphs just monitor the clickthroughs. Nowadays there are way more sites covering SL, so in percentage the SL website itself gets less clicks than 2 years ago. As nice as the "new" Google feature is - as with any statistics, it needs background knowledge and interpretation.