Ichiro had three problems (1) he was a corner outfielder who didn't have any power, (2) he never drew a walk so his on-base percentage was not as good as you would expect given his batting average and, by far most importantly, (3) he spent most of his peak years in Japan. Most players produce most of their value in their 20s, and Ichiro spent most of his 20s overseas. If you combine his production in Japan and USA he's easily qualified, but historically the only non-MLB play that the American hall recognizes is the negro leagues. (Otherwise guys like
Buzz Arlett would be in the hall.) Like I said above, however, I think that even his just-USA performance is worthy of enshrinement, and I suspect that he'll get some extra credit in Japan and get inducted there too.