I just don't see why you would trade Hammer to bring in a "2nd line C" when you can just sign a guy to fill for the PK, faceoffs, and defensive responsibilities and keep Hammer. It doesn't make sense.
Dave Bolland is a top 2 center in this league. He would be just fine. Compare him to everyone's hero, Brooks Laich, who apparently is a "2nd line C", and you'll see Bolland is actually just as good as him.
We all know how good defensively Bolland is, but I think many overlook his offensive game. Compare his points per game with centers in the league, he falls in the same category as guys like Laich, Brassard, Connolly, Bergland, Jokinen, Bouchard, Weiss, Legwand, S. Koivu, Antropov, Fisher.... if those guys aren't top 2 centers, then who would be? After Dec 5th, which IMO was the end of Bollands slump, Bolland posted 33 points in the remaining 39 games of the season. Remember Bolland had a bad back to start the year and had some time to adjust. If Bolland paced that over the season he would have around 67 or 68 points to end the year. Even if he is on pace with last year, including his beginning of the season slump, he'll come out around 50 points for the year.
His time on ice per game is also similar to guys like Bergeron, M. Richards, Laich, Fisher, Jokinen, Brassard, Berglund, Connolly, etc.. etc..
What more do you want in a top 2 center? I don't know. Forget the whole "2nd line C" and just grab a C who can get his hands dirty and play the PK. We don't need to make a big splash, if we do, we should do it at the deadline. We have our top 2 centers on this team, Toews and Bolland. Depth at the center position is welcome, but we don't need another star player. We simply don't have the room, and to get rid of Hammer in order to make room for that is unnecessary when we already have a guy that can fill that role.