Should he stay retired or play?

Brett Favre has been mulling coming out of retirement for the second time in two years, but this time he is doing it and thinking about playing for the enemy of the team that made him who he is a Legend, but should he do it? Just recently there are reports that say that he had surgery to repair his torn shoulder muscle and that he is currently throwing but still feels uncomfortable. Then there are also reports that came out that say he needs to inform the team by this week of his intentions and also reports say there is no such deadline. No matter what the deadline is should he do it, should he come out again? Let me know what you think?
Heres what I think, If any of you care. I think he should come out of retirement to play for the vikings. I think that he feels like the Packers drove him out early and that he wants to prove to them that he can still play and play better then Rodgers. I do believe that Brett is a big boy and he realizes that there are a lot more games then just the two he will play against the Packers and that he has to be motivated for all of them. I feel with the surgery he is fully committed to coming back and that its only a matter of time before we see Favre wearing Purple.