In the case of the Bautista situation I think a lot of people are underestimating how smart Bautista is. If he can come back and hit like a crazy that alone will get him the money he wants. Teams already know that he is capable of playing the OF, if you throw him at 1B I can only see that helping his value.
You'd have a backup 1B, 3B, OF and is one of the best hitters in the game.
EDIT: The Jays could easily say when Bautista comes back that they want him to play 1B to get him off the turf to help his toe get to 100% or some sorta BS like that.