I think we keep him for another year, but have Cruz or similar waiting in the wings if he tanks again.
After this season, nobody would want him, so we wouldn't get salary relief nor player in return.
Thus, cheapest option is to have the $800k Cruz or Spivey available. I agree with Bowden, the best option would be to "fix" Guzman.
It would help if he would show up in shape next year, lose that gut and show us some of that reputed speed on the bases.