Cobb serves zero purpose for this team.
You aren't going to get anything significant in return for him. Now, tomorrow or next year.
You get rid of as much of the contract as you can.
You don't need to trade potentially good players to dump salary (like some teams might consider based on financial limitations of certain contracts). For example, I'm not adding DL Hall to a deal to move salary now or later (even if he's terrible and released).
...but they've given no indication about caring about next year,so you still be smart and get rid of as much of the contract as you can.
Like I posted in the Game Thread.
Boston: Cobb, McKenna and 7.5M (2.5M this year, 5 M next year) for Danny Diaz and 2 other ('18, '19 draft or IFA types)