This news screams to me a management team needing to make a move to get this team to the playoffs to save their jobs or job (Neely).
I'm not sure. I think it will be more of a problem long term than short term. Carlo is staying in the NHL, Shattenkirk will probably want to and will play in the top 4, and McAvoy will probably make the team next season, maybe even play a game or two at the end of this season.
Let's say the Bruins decide to go with Shattenkirk, Carlo, and McAvoy on the right side, the Bruins will have to move Kevan Miller, Colin Miller, and Adam McQuaid which may prove to be a difficult task if Kevan or McQuaid aren't claimed in the expansion draft. Down the line, Carlo and McAvoy will be needing new contracts and even if Chara may be gone by then, the Bruins will have other prospects at forward to accommodate as well.
In my opinion, the Bruins should stay away from Shattenkirk. Who knows how long Bergeron and Rask will be out for, and even if both are healthy, the Bruins need to fix lines 2-4 to even remotely believe they'll even make it let alone get anywhere in the playoffs. I've mentioned this a lot last season. The Bruins have defensemen that can carry the puck out of their zone (Krug, Morrow, Colin Miller, Carlo can, McAvoy can). The problem isn't the personnel to achieve that goal, it's the system that relies on heavy defense. Place Shattenkirk, who at best in my opinion is a 2nd-pairing defenseman that will need a defensive anchor as a partner, in Julien's system, and all he would be is an offensive specialist that would be taken advantage of in his own end. In my opinion, Shattenkirk isn't worth the rental price as he isn't going to suddenly change this team and signing him long-term is an even worse decision given where the cap may be, the signings that need to be made (Pastrnak), and the upcoming prospects that can eventually provide the same thing or even more than Shattenkirk can at the price of an entry-level contract.
Shattenkirk is a big name that fans of any team may want, but in my opinion, he's not a fit or worth the price to trade for and/or sign for the Bruins.