John Schneider will choose the next coach based on who he thinks is the best, without regard to loyalty or past connections. He knows that this next hire will determine his future. If the next coach doesn't work out, they will both be gone.
As for Dan Quinn, I wouldn't judge him on one game, but it is very worrisome that his defense gave up 42 points to the 49ers, 35 points to the Seahawks and 28 to the Cardinals. The only NFC West team his team was able to handle was the Rams, which they held to 20 points, but the Rams played that game without their starting RB and left tackle. (I mean, c'mon, the Seahawks held the 49ers and Cardinals to fewer points!!) They also gave up 31 points to the Bills.
The Cowboys were able to pad their defensive stats by playing 4 games against the Giants and the Commanders, the Patriots, the Panthers and the Jets this year. Quinn's defense did do a fairly good job against the Dolphins (22 points) and the Lions (19 points).
And even though it is just one game, for the Packers to put up 48 points yesterday in a playoff game is surely indicative of something.