1: Retiring in the middle of a tournament would be a crazy idea and though Zlatan is a bit of a special person, I'm a 100 % sure that he will not do so.
2: Zlatan has the chance of being the first player to score in 4 Euro's (so could C. Ronaldo). If he scores 2 he can't be equalized. He could even end up as the top goalscorer of the history (though I doubt that will happen). Zlatan is the kind of person who wants to break records and make his status as legend even clearer, an will surely not give up on these.
3: As others say. Be careful with the other 2 teams. Sure, they are both favourites against Sweden, especially with Belgium mentioned as a medal contender, but they are not unbeatable, especially when you have Zlatan on your team. We have seen bigger surprises than it would be!
4: A draw could even be enough for qualifying (I doubt it will be, but it could be)