He probably will play again. He is still able to perform.
I think the real question is going to come down to how bad the beating was on him yesterday. It was obviously physically rough on him but the mental aspect won't come into play for a few more days or atleast until after the Superbowl. He knows he's in the twilight of his career and he was [-----] close to making it back to the big dance one more time. With all the criticism against him for playing again, it would have been the icing on the cake for him to atleast make it there one more time.
I think if the Saints win the Superbowl, he might actually retire. The idea of "that should have been us" especially after him throwing that interception in the 4th when he should have just ran 5 more yards and then out of bounds, might eat him up enough.
Who knows though? He's unpredictable with his retirements and he's felt disappointment before. If he plays again, I don't mind it. I know it's going to piss alot of people off though.