I think Massa could do ok when he's out of the ferrari limelight, I think a combination of constant speculation, the accident, and Alonso annihilating him has hurt him pretty badly, but in another side, most of those factors are gone.
However, I'm not sure which mid tier seat would open up for him right now. Williams look like they could have a settled pair ( early days I know etc ) for a couple of years, and there's always the competition of a returning Kubica ( if ever ) or Sutil again I suppose. Meh, I dunno, but the one certainty is that he has no future with Ferrari.