Dickey is having his worst season as a Jay, but he's had at least some utility: he's still been worth about a win. He's actually been better than what most teams have thrown out as their 5th starter, even though it doesn't look pretty. He's probably not going to get 10-12M again this offseason, but there's still a price point at which it makes baseball sense to bring him back. What is that price? 4-5M + no personal catcher to pitch in a long relief/6th starter role?
I'd probably decline just because I hate watching him and even the possibility of seeing Josh Thole back makes me sick, but you can easily make a baseball case for bringing him back.