They have only been on the island since the end of September, so even Analucia, Libby, Echo, Niki and Palo have died just a matter of weeks ago. Charlie has only been dead a few days and he kicked the bucket the end of last season. In other words, yeah, Jin is going to die in just a few days. I'd give him a week at the most, but to us it will either next week, or sometime in April, May, or June.
This episode didn't suck as much as last weeks, but I felt like they went WAY out of their way to trick us again. Sure glad this didn't end of being "the mini-finale" that would have sucked and ended this run on a very low point. Next week's episode should be good, it will also be the last episode untul the end of April.
I don't think Jin is still alive, I think this will be his last season. I have feared for Jin's life every since the actor got that DUI. DUIs for actors are typically the end their character when it comes to Lost. I really thought Jin would make it off island and die sometime in the flashforward. I was surprised.