Numbers with several zeroes are commonly milestones in sports. 400 goals (hockey), 100 goals (soccer), 30,000 points (basketball) -- etc., mark truly outstanding careers in those sports.
So add to that the milestone of 3,000 hits in Major League Baseball. 29 players have accomplished that, and when Ichiro gets his next four hits, he'll be the 30th to 3,000. (Of course, he hit hundreds more in Japan, which begets a controversy I won't touch.)
So let's stick to 3,000 being a major mark. And Ichiro will get there by the end of July, I think.