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By no means is this meant to be definitive, but I was curious is poor performance against fastballs is any kind of indicator. At first it looked real bad for Ichiro, as the people I looked up [Ken Griffey, Jeff Bagwell, Frank Thomas, and Edgar Martinez] all had their first and only negative performance against fastballs in their last seasons [note that fangraphs data only goes back to 2002]. Derek Jeter is struggling like never before this year and he is also showing his first negative performance against fastballs.
But I did some more digging, and the rule didn't apply to Craig Biggio (never negative), Jason Giambi, or Carlos Delgado. Not sure if this real or noise.