The Packers have not shown the ability to effectively gain short yardage situations all year.
Vs. Detroit, we were down to our #3 left guard, the 4 man rush of detroit wasn't allowing our backs to even get to the LOS untouched all game, and the avg of our RBs that game was 2.7 (BJ), 1.3 (Stark), 2.0 (Nance)...keep in mind that those averages weren't typically with a loaded box.
I'm not saying the bomb was necessarily high percentage, but it's hard to convince me that a run, given all those circumstances was a substantially better option than our #1 wr vs. an aging street free agent cb.