Most observers that follow the Houston Astros seem to agree that the most likely outcome with Framber Valdez is that he will leave in free agency. The team absolutely will not admit defeat until he signs somewhere else, but Valdez's rumored asking price is already well beyond what the Astros would be comfortable with. If re-signing was truly in the cards, the two sides would have already reached a deal by now.
Still, that hasn't stopped experts from insisting the door is technically still open. Bleacher Report did just that in their recent piece on Plan Bs around MLB this offseason.