Today's not the day to take this view, but honestly, I think he needs another WS win. Sparky got in because he managed the Big Red Machine and then another mini-dynasty with the mid-80s Tigers.
The big pluses for Davey's case: Second highest win% of those managers not in the Hall; solid record as a player which counts too. Another big thing in his favor is that he compares favorably to Whitey Herzog, who's in already.
The big minuses: "Only" one WS win, relatively few years (and thus, overall wins) as a manager.
I think Davey's in line behind Cox and La Russa and maybe Torre and ahead of the likes of Piniella and Leyland. If we end up being the 2012-2017 dynasty we want to be and manage to win a series or even two and Davey is the manager for all that, then I think he's in. But as he sits right now, borderline, to no - a lot fewer managers get in than everyday players. Of course, as much as he says he doesn't want it, winning Manager of the Year this year would help, too.