It depends on how his achilles heals, really. He's a big man, on the other side of 30, and has one of the hardest injuries to rehab from in the NFL. Combine that with what he does, which is essentially eat up space and take on two blockers at the point of attack (something that requires a high amount of stress on the injured area), and he has a long way back. If he can't recover fully, which is a very real possibility, the team might part ways with him and target a DT either in FA or through the draft. If he can, then I'd certainly hope they would bring him back.