I'm not sure why the Habs would move the contract? He's on LTIR and obviously not coming back. He's not costing them anything really is he? What kind of piece would it take to acquire that contract?
Couple of possible reasons ~ he technically
is costing them, in the sense that they need to be cap compliant to open the season. Someone far more proficient in cap matters can probably explain it far better than me, but basically it can complicate any moves they try to make. He also takes up a contract slot.
As to your final question, I very much doubt he has much, if any, value. Sure, Montreal can play the '"We're rebuilding and don't really care" card, but teams flush with cap space will have plenty of options, some of which that will involve being paid assets to take on salary.