I'm not even opposed to him as a starter, on a one year deal (but obviously at much less than he's making this year).
We really, really need at least one solid to high end SP this offseason, and there aren't many really good options. Arrieta, Darvish, and Otani are probably the big three (I don't think Tanaka will opt out). A guy like Estrada or Liriano would make a good 5th starter.