What is the alternative?
To qualify him and then either offer him a contract that is what he could get in arbitration or let him take them to arbitration and hope for the best?
I'd assume he would get right around the 3.5M magic number in arbitration. If he gets less they have to sign him. If he gets more they have to choose if he is worth it and sign that deal or walk away.
Any arbitration award would be for two years since he is more than one year away from UFA status, so that two year deal would leave him a UFA at the end of it. Then what? What if he is still the same player we see for those two years, they are not going to sign him again anyway and they regret having him for those two years?
Do they really want MDZ on the team? Seems to me the Rangers system requires players who can read the game, Does MDZ read the game at a high level?
From there what exactly does he bring to the team that can not be had cheaper and probably better?
He's not very good on the power play with his choices. He does not have a hard shot. He does not do a great job of rushing the puck. His only redeeming value is he is about average defensively and he can make some nice passes at times when he decides to take the extra step and make the play happen instead of just throwing the puck up ice.
Del Zotto was a benefactor of two things in his career to this point. First being Gaborik. He would literally give the puck to Gaborik and from there Gaborik would do something with the puck that gave MDZ points. It's not all that much different than Prucha with Jagr, although I still think MDZ is a better player than Prucha was.
The 2nd thing that benefited him was Tort using him as the only defense on the power play for two seasons. He got his points mostly from that coaching decision. Even Torts himself said he messed up by not playing McD on the power play, but really his choices were limited considering the ice time McD already was getting.
If they can get something back for MDZ, and lower the ideas about what it will be, they should take it. He just does not fit and he's going to get more expensive in his next contract.
If his value is low now, to other teams and to the Rangers, what will his value be on a more expensive deal?