I agree with dave, Marmol is a guy who could get traded if they think value is good. And given his age, impending free agency, and chronic control challenges, his long-term value to us is limited, so of course he'd be available. He's not that valuable to us, so if somebody offers real value, of course it makes sense to a rebuilding team.
But like deeg said, I just don't see where the trade value is. He's not that valuable to us, but he's not that desirable to other teams either. Are super-powers making so wild a pitcher a premium trade target, and eager to pay a serious prospect and his $9 million salary to rely on him as their closer? That ship has sailed. The other team could go for Soria, or could have gone for Madsen or Fuji, or for that matter Grilli.
My guess is that if you were able to trade him, it will either be for a high-risk overpay, as in the Haren crumble. Or some pretty modest prospect, more like Brigham than Vizcaino. And maybe you'd need to pay many of his millions even for that. He just doesn't pass the reliability test.
If he does go, I think it will be for somebody who acquires him as a late-inning depth guy. A setup person, as he was when Dempster was closing. Or just another possibility, in case their intended closer doesn't work. Madsen, old Rivera, Detroit, there are some teams who can't assume their desired closer will be good.
I hope he gets traded, because if so that will mean Hoyer thinks he's getting a value and I'm all for replacing short-term expiring assets for younger longer-term possibilities. But that's probably more wish than expectation.
I do think there could be value for his career to reorient to a setup guy. It seems like there is a much longer record of setups who are really wild than closers. In closer role, if a guy goes into a slump it's hard to live with. If you've emptied your pen getting to the 9th, you've got to live-or-die with the closer, whether he's on or not. But in 7th inning, if a guy is struggling for a while you can reduce his usage some until it gets better, or be quicker to pull him. Marmol may well have many inconsistently productive years ahead of him in that role, if his arm holds up.