Excellent question. Look to Indiana Twin for the answer:
There is still a case for staying with Rogers, but he will not be able to go the distance. Even if he made it all the way through the 8th, it still means turning the 9th over to Robles (or Colomé). At that moment, nobody could know that Donaldson would tie the game in the bottom of the 8th (think about it - the only reason Duffey didn't get the Big L is because of the Rainman). If the Twins do not score and lose 4 - 3, then everyone but Shoemaker, Jax and Colomé are blown for Saturday's contest. What does that do for our chances of converting a good outing from Berrios into a W?
It's a balancing act. Some choices have a higher probability of success than others. This takes us back to making the most of the tools at hand. The on-field manager could be faulted for any number of decisions, but there is also the undeniable fact that he wasn't given great arms to work with. Hell, we're damn lucky that Ober has pitched as well as he has.
Oh, and before we make this all about pitching, let's not forget the bats went 0 - 2 RISP and left 4 more runners on base today. Ptui.