I don't really think it's that big of a deal to be honest. Let's suggest for a moment that this is a Knoblauch style yips scenario which we frankly don't know for certain it is. As the article suggests his time to the plate is still better than average. The cubs invested heavily in defense at C this offseason. Given that, you would expect the catchers to be above average at throwing people out. Additionally, if this is a case where he's afflicted mentally, trying to mess with it could do more harm than good. Case in point, look at good ol Rick Ankiel. He went down this path and never got it back.
What's important is that he pitches well. If he doesn't let many people on this is a moot point. Keep in mind only 38 players last season stole 15 or more bases. So, you're talking 1 maybe 2 guys on major league teams who are above average at stealing anyways. Why's this matter? Well you're not going to run with a power hitting 1B.
Obviously it's not an ideal situation but at the end of the day it didn't hurt him last year so I honestly think people are putting to much emphasis on it.