I'm not so sure. With the future of both Chara and Krug up in the air, I don't think it would be wise to remove the only other veteran LHD on the team. If they let Krug and Chara go, Moore gives you insurance against Vaak and Lauzon's growing pains. Plus, the B's will want 8 defensemen for the playoffs. One of Moore, Miller and Kampfer has to go, but not sold it will be Moore. I would think Miller, with his expiring contract, will be easier to deal.
Having read the replies and thinking this through a bit more, I now think the plan is to get Miller into the lineup as soon as he's healthy so they can show the league he's still a viable player, then move him before Moore is ready to return so you open up a roster spot for Moore. You're 8 playoff defensemen would then be...
Gryz - McAvoy
Krug - Carlo
Chara - Clifton
Moore - Kampfer