Define consistency.
Consistency: NOTLD after he decides that he doesn't like a player. When he decides that he doesn't like a player, he doesn't ever waver, no matter how good or bad the player performs. Good performance, or bad performance, no-hitter or 7 runs in 2/3 of an inning, bat .320 or bat .220.....if said player is on NOTLD's hate list, he gets the venom. NOTLD is the very definition of Consistency.
now, for my opinion on the matter, I recognize that Bergmann is little more than a back of the rotation starter, and that we should be looking to upgrade. He's not a star. He never was. He never will be. But *for now*, as long as he has more good starts than beachball starts, I'm okay with him.
this is Bergmann's last chance, as far as I am concerned though. I'm adopting a "what have you done for me lately" approach in this case. you really have to, because we never know which Bergmann is going to show up for a particular start.
once the beachball starts begin to outnumber the good starts, he needs to go.