I am not sure about trading bolland at this point. But on the other hand a shakeup might be in place. I would not specifically look at centers exactly, i would look for wingers as well and move sharp/kane to center if there is a player to be had out there. maybe a winger that can move in the top 3 spot so you can move stalberg down to the 3rd line.
I don't see Kane/Sharp as the Blackhawks answer to center.
I would say Sharp but apparently he has let it be known that he wants nothing to do with the center position and wants to stay on left wing.
Kane really faded off after his strong start at center and his faceoff numbers dropped big time.
Kruger is good defensively but he brings nothing to the table offensively, which is what a 2nd line center should bring.
Definitely a tough position and Bolland is a player that isn't the core but would possibly be valuable to another team in a trade. Let's all face it, if most people want Bickell/Frolik/Etc traded...then there is a reason for that and it isn't because they are lighting it up and have high trade value.
I'd go for a Center before a wing. Especially with kane/sharp/hossa as 3 out of 4 on the top 2. Right now I feel the Blackhawks only have 1 out of 2 with Toews when it comes to the top 6.