This MSNBC article talks about how Ripken could possibly be unanimus, but probably not. Nothing especially earth shattering here, just mentions how Ruth "only" got 95% of the vote, and some others.
Has quotes from Palmer, Flanny, Schmuck, and Brooks- all of them basically say "well he could be and maybe should be, but he won't because no one else has."
Also, random aside: I found out this morning that as of a couple years ago, the Washington Post writers don't vote anymore cause the company decided they shouldn't. Was sort of surprised by that.
http://www.msnbc.msn.com/id/16488348/