The big thing is replacing the players on the right side which is why it's unlikely Girardi is going anywhere anytime soon...sure, if McIlrath can come in and play that side after Boyle leaves then great, but he's like the only RD prospect the Rangers have that's anywhere close to ready. Mayyyyybe if Andersson or Zamorsky can take some big steps this year in the AHL and force their way onto the team as a kind of Dan Boyle replacement then you have much more leeway on how you perceive moving guys like Girardi and Klein, but I think both of those prospects have a lot to prove at this point still.
That said, probably not much is going to happen during this season with those players, this is more long range thinking and probably goes in the other thread, but the bottom line is the Rangers are going to need some more prospects to step up and will have to make some tough decisions about long time vets and available cap space. I also suspect the Rangers are crossing their fingers the cap can somehow take a jump next season that helps them out a bit