I'm not saying Chisenhall is the solution and the only solution, but he's got some upside, is free salary wise, is under control for a while, and I think he's better than any other 3b prospect we have in the system right now (outside of Baez, but he's still a SS prospect until we hear otherwise). He'd be a super solid addition. Just because he's not a stud, doesn't make him solid.
Lastly, on the topic of 3b....it's not getting any better. You've got some young kids coming up, like Moose, Pacheco, Alvarez, Lawrie, Olt....but some of them will fail, and the ones who are left are really only going to be able to replace those on the list who are old and getting older. 3b is going to stick this way, probably, for a while. Offense has shifted to other positions.