Wilburforce - 12:49 pm on Oct 12, 2012 (gmt 0)
the serps for my sites seem OK but no hits
So either people are finding but not selecting your sites or
WMT reports a huge drop in search termes
there are less searches for those terms on Google.
IF - someone searches for a term on Google
AND - your site is well-placed in the results
THEN - lack of traffic cannot be attributed to Google.