Well, I guess we'll find out in Book Three, now won't we? There are so many unanswered questions through out the show!
But, in my opinion, I sort of hope he dies. No, I don't hate him or anything, I just think a real death is in order for Avatar. (Oh, wait, Zhao died. . . gonk ) But what I mean is, a good-guy dying. None have so far. Besides, with all the fighting, drama, and such, it wouldn't be surprising to see someone die. It would just add more drama. But then again, so would the question on whether or not Jet died for sure. He wasn't too important a character, anyway, though he did add some interesting plot effects with the whole: "You're from the Fire Nation!! scream " scene at the tea house and then getting brainwashed. But besides that, he hasn't been too interesting to me.
I dunno what to say about this. I'll just wait till the new season to find out how many of my own questions get answered. . .and how they'll get answered!