Johnson done a lot better and most Saints fans feel more comfortable with him,.at least in the short-term, kicking FGs and XPs then Rosas did, until Lutz decides he's sufficiently healed enough. Your argument has some flaws to it because knowing Alvin is deep in the red zone, he's a fighter and likely couldve run it in for a TD.
Giving Brady 1:46 to drive his team down the field 40-50 yards for a potential GW FG makes more sense somehow then him getting the ball back with 71 seconds left? Payton's risky series of plays worked out in the end due to the defense bailing us out(for the win with an INT return for a TD).
Other than the last 2:00 minutes of the game today, I'd argue Payton's play calling was very good, in the "above-average" range.