One mediocre season isn't enough to make me throw Paps under the bus. He needs to show that he can make some adjustments though. That's one of the things that allows dominant pitchers to stay effective as they get older. Right now he's still trying to throw it by people. He needs to move to the next phase of a pitcher's career where he learns to pitch smart, as well as hard. If he can't, and it's obvious by the time FA comes along, he needs to go.
At the moment though, he's still a very strong pitcher statistically even if he isn't as great as he used to be . 153 ERA+ doesn't grow on trees. I think fans need to adjust their expectations with Paps too. As he settles into a career, he's not always going to be brilliantly unstoppably awesome, sometimes he's just going to be really good, and we need to look at that and not have our expectations so out of whack that we call that "awful.'